Reference · Dr Sin Yong · Singapore

Evidence Library

Published research on common aesthetic treatments, in plain summaries with links to each source.

In Brief

This library lists peer-reviewed studies and regulatory statements on common aesthetic treatments. It includes positive, mixed and negative findings. A study on one device or protocol does not prove results for another, and no study can predict your own result.

Topics in this library

HIFU

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  • Systematic review: A 2023 systematic review of 16 studies, mostly in women, reported investigator-rated improvement in 92% at day 90; treatment was moderately painful, transient redness was common, and other adverse effects affected 2%.Contini M, et al. A Systematic Review of the Efficacy of Microfocused Ultrasound for Facial Skin Tightening. Int J Environ Res Public Health. 2023;20(2):1522. View source · DOI · PMID 36674277
  • Systematic review: A 2025 systematic review of 45 clinical trials and cohort studies reported skin laxity improvements of 18% to 30%; its side-effect table lists mild redness in 30-50%, swelling in 10-20% and tenderness in 15-25% of patients.Haykal D, et al. A Systematic Review of High-Intensity Focused Ultrasound in Skin Tightening and Body Contouring. Aesthet Surg J. 2025;45(7):690-698. View source · DOI · PMID 40184185

Ultherapy

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  • Systematic review: A 2025 Merz-funded meta-analysis of 42 studies reported investigator-rated improvement in 89% (n=411) and mean pain of 4.85/10; authors said neutral responses may overestimate efficacy.Amiri M, et al. Microfocused Ultrasound With Visualization (MFU-V) Effectiveness and Safety: A Systematic Review and Meta-Analysis. Aesthet Surg J. 2025;45(3):NP86-NP94. View source · DOI
  • Narrative review: A 2014 narrative review by a device-maker author reported typical effects of tenderness, redness and slight swelling, with rare bruising, welts and nerve effects; no sample size or rates were given.Hitchcock TM, Dobke MK Review of the safety profile for microfocused ultrasound with visualization. J Cosmet Dermatol. 2014;13(4):329-335. View source · DOI · PMID 25399626

Radiofrequency

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  • Cohort: A 2024 single-treatment study of 20 Asian women reported dermatologist-rated jowl and nasolabial laxity improvement at 12 and 24 weeks, no burns or scarring, and no significant change in pores or wrinkles.Shin J, et al. Efficacy and Safety of Monopolar Radiofrequency for Tightening the Skin of Aged Faces. Cosmetics. 2024;11(3):71. View source · DOI

Thermage

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  • Pilot study: A 2004 pilot tissue study in two abdominoplasty volunteers reported immediate collagen fibril contraction and increased collagen I mRNA, with no observable light-microscopy changes at 3 or 8 weeks.Zelickson BD, et al. Histological and Ultrastructural Evaluation of the Effects of a Radiofrequency-Based Nonablative Dermal Remodeling Device: A Pilot Study. Arch Dermatol. 2004;140(2):204-209. View source · DOI · PMID 14967794
  • Expert opinion: A 2005 expert opinion article, with no study sample, stated patients can generally expect a 5% to 20% improvement and that results in any particular group are unpredictable.Burns JA Thermage: Monopolar Radiofrequency. Aesthet Surg J. 2005;25(6):638-642. View source · DOI · PMID 19338872

Fractional CO2 Laser for Acne Scars

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  • Systematic review: A 2025 systematic review of seven studies reported most patients showing roughly 30% to 70% improvement, with transient redness, swelling and post-inflammatory hyperpigmentation the most common adverse events.Ptaszek B, et al. The Use of a Fractional Laser in Acne Scar Treatment-A Systematic Review. Life (Basel). 2025;15(6):915. View source · DOI · PMID 40566567
  • Systematic review: A 2026 network meta-analysis of nine randomised trials found the leading treatment comparisons had confidence intervals crossing the null, rated confidence low or very low, and said no reliable treatment ranking currently exists.Liu Y, Zhang Z, Zhao J Minimally invasive interventions for atrophic acne scars: a PubMed/PMC-based systematic evidence review and exploratory network meta-analysis toward phenotype-guided interpretation. Front Surg. 2026;13:1943995. View source · DOI

Subcision

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  • Narrative review: A 2023 narrative review, with no patient sample, grouped subcision tools into needles, cannulas, wires and blunt-blade devices, and reported that use varies by scar depth and preference.Vempati A, et al. Subcision for Atrophic Acne Scarring: A Comprehensive Review of Surgical Instruments and Combinatorial Treatments. Clin Cosmet Investig Dermatol. 2023;16:125-134. View source · DOI · PMID 36698445
  • Cohort: A 2026 uncontrolled study of 44 Vietnamese patients given three sessions reported mean Goodman and Baron grade falling from 3.3 to 2.1, with pain in 93%, swelling 41%, erythema 34%.Nguyen LV, Lam TT Treatment outcomes using subcision combined with platelet-rich plasma for atrophic acne scars: a study in Vietnamese patients. Skin Health Dis. 2026;6(4):477-484. View source · DOI · PMID 42539967
  • Cohort: A 2019 uncontrolled study of 45 patients with Fitzpatrick III to V skin reported 95.6% improving by at least one grade, with redness, swelling and pain lasting 1 to 2 days.Bhargava S, et al. Subcision and Microneedling as an Inexpensive and Safe Combination to Treat Atrophic Acne Scars in Dark Skin: A Prospective Study of 45 Patients at a Tertiary Care Center. J Clin Aesthet Dermatol. 2019;12(8):18-22. View source · PMID 31531167

TCA CROSS

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  • RCT: A 2011 randomised trial of 30 patients reported scar severity improving by a mean 68.3% with collagen induction and 75.3% with 100% TCA CROSS, a non-significant difference (p=.47).Leheta T, et al. Percutaneous collagen induction versus full-concentration trichloroacetic acid in the treatment of atrophic acne scars. Dermatol Surg. 2011;37(2):207-216. View source · DOI · PMID 21269351
  • Narrative review: A 2021 review of 19 articles reported 60% to 100% of acne scar patients showing over 25% improvement, noting small samples and lack of control groups across studies.Chung HJ, et al. Chemical reconstruction of skin scars (CROSS) method for atrophic scars: A comprehensive review. J Cosmet Dermatol. 2021;20(1):18-27. View source · DOI · PMID 32573079
  • Narrative review: A 2026 review of 34 publications and 937 patients reported improvement rates of 50% to 80%, with higher TCA concentrations raising complication risk; only one Fitzpatrick VI patient was included.Stratman S, He H The Use of Chemical Reconstruction of Skin Scars (CROSS) Method With Trichloroacetic Acid (TCA) for Atrophic Scars: A Comprehensive Review on Application Techniques, Adjunct Therapies, and Complications. J Clin Aesthet Dermatol. 2026;19(6):52-67. View source · PMID 42482854
  • Cohort: A 2024 prospective comparison of 60 analysed patients found 58.06% rated good improvement with 65% TCA, which caused more adverse effects, including acneiform eruption in about a quarter versus about 13% with glycolic acid.Roy G, et al. Study to compare the efficacy of 50% glycolic acid with 65% trichloroacetic acid in the treatment of atrophic acne scar by CROSS technique. J Cutan Aesthet Surg. 2024;17(3):198-204. View source · DOI · PMID 39483659

RF Microneedling

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  • Systematic review: A 2025 systematic review of 16 studies and 481 patients concluded fractional radiofrequency microneedling is likely effective alone, and called for further randomised trials on treatment parameters.Niaz G, et al. Fractional Radiofrequency Microneedling as a Monotherapy in Acne Scar Management: A Systematic Review of Current Evidence. Clin Cosmet Investig Dermatol. 2025;18:19-29. View source · DOI · PMID 39781098
  • Cohort: A 2025 retrospective study of 397 Thai patients reported mean 6-month improvement of 54.89% with fractional radiofrequency versus 47.53% with laser (p=0.059), with more pain on radiofrequency.Yan C, et al. Comparative Effectiveness and Safety of Fractional Laser and Fractional Radiofrequency for Atrophic Acne Scars: A Retrospective Propensity Score Analysis. Life (Basel). 2025;15(9):1379. View source · DOI
  • Case series: A 2018 preliminary uncontrolled study of 19 patients given 2 to 6 monthly sessions reported mean pain of 1.5/10 and no burns, scarring or pigment changes.Elawar A, Dahan S Non-insulated Fractional Microneedle Radiofrequency Treatment with Smooth Motor Insertion for Reduction of Depressed Acne Scars, Pore Size, and Skin Texture Improvement: A Preliminary Study. J Clin Aesthet Dermatol. 2018;11(8):41-44. View source

Acne Scar Types

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  • Rater reliability study: A 2016 rater-reliability study with three raters found only 65% of scars classified identically across two sessions, and proposed size rather than shape as the primary criterion.Kang S, et al. New Atrophic Acne Scar Classification: Reliability of Assessments Based on Size, Shape, and Number. J Drugs Dermatol. 2016;15(6):693-702. View source · PMID 27272075
  • Narrative review: A 2017 narrative review, with no patient sample, focused on atrophic scars as the most common type and described an algorithmic treatment approach based on erythematous and atrophic scar types.Connolly D, et al. Acne Scarring—Pathogenesis, Evaluation, and Treatment Options. J Clin Aesthet Dermatol. 2017;10(9):12-23. View source · PMID 29344322
  • Narrative review: A 2011 narrative review, with no patient sample, gave a step-by-step evaluation approach and treatment algorithm for atrophic acne scars, using three types: icepick, rolling and boxcar.Fife D Practical Evaluation and Management of Atrophic Acne Scars: Tips for the General Dermatologist. J Clin Aesthet Dermatol. 2011;4(8):50-57. View source · PMID 21909457

Acne Treatment Guidelines

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  • Professional guideline, GRADE: A 2024 American Academy of Dermatology guideline made 18 recommendations, strongly recommending benzoyl peroxide, topical retinoids, topical antibiotics and oral doxycycline, with isotretinoin for severe acne.Reynolds RV, Yeung H, Cheng CE, Cook-Bolden F, Desai SR, Druby KM, Freeman EE, Keri JE, Stein Gold LF, Tan JKL, Tollefson MM, Weiss JS, Wu PA, Zaenglein AL, Han JM, Barbieri JS Guidelines of care for the management of acne vulgaris. J Am Acad Dermatol. 2024;90(5):1006.e1-1006.e30. View source · DOI
  • Expert consensus, seven Asian countries and France: A 2026 Asian expert consensus cited post-inflammatory hyperpigmentation in 58.2% of 324 acne patients surveyed across seven Asian countries; it is expert opinion, not a clinical trial.See J, Sitohang IBS, Wong SN, Azizan NZ, Noppakun N, Van TT, Dreno B The Role of Dermocosmetics in Acne Management: Asian Perspective. Clin Cosmet Investig Dermatol. 2026;19:1-10. View source · DOI

Pigmentation After Laser in Asian Skin

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  • Narrative review: A 2024 narrative review, with no patient sample, stated that melanin competes as a chromophore in dark skin and that high energy, pulse stacking, short wavelengths and short intervals should be avoided.Harnchoowong S, et al. Cosmetic Considerations in Dark-Skinned Patients. Clin Cosmet Investig Dermatol. 2024;17:259-277. View source · DOI · PMID 38321987
  • RCT: A 2022 randomised split-face trial, funded by Beiersdorf, of 59 patients with phototypes III to IV found no significant difference in pigmentation score between sunscreens after picosecond laser.Puaratanaarunkon T, Asawanonda P A Randomized, Double Blinded, Split-Face Study of the Efficacy of Using a Broad Spectrum Sunscreen with Anti-Inflammatory Agent to Reduce Post Inflammatory Hyperpigmentation After Picosecond Laser. Clin Cosmet Investig Dermatol. 2022;15:331-337. View source · DOI

Melasma

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  • Systematic review: A 2022 systematic review of 42 articles judged the laser generally effective, but reported mottled hypopigmentation occasionally persisting, hyperpigmentation with aggressive use, and a lack of long-term follow-up data.Lee YS, et al. The Low-Fluence Q-Switched Nd:YAG Laser Treatment for Melasma: A Systematic Review. Medicina (Kaunas). 2022;58(7):936. View source · DOI
  • RCT: A 2023 randomised trial of 60 women reported week-24 MASI improvement of 35.9% with picosecond Nd:YAG, 25.5% with alexandrite and 24.0% with hydroquinone; four patients (6.8%) had recurrence.Liang S, et al. Comparison of the efficacy and safety of picosecond Nd:YAG laser (1,064 nm), picosecond alexandrite laser (755 nm) and 2% hydroquinone cream in the treatment of melasma: A randomized, controlled, assessor-blinded trial. Front Med (Lausanne). 2023;10:1132823. View source · DOI
  • Systematic review: A 2026 meta-analysis of 31 studies and 2,801 patients reported 92.0% efficacy with combination therapy versus 77.4% monotherapy; follow-up was short, and recurrence data came from four studies.Zhang Y, et al. Efficacy and safety of Q-switched laser combined with intense pulsed light in treating melasma: a meta-analysis. Front Med (Lausanne). 2026;13:1749950. View source · DOI · PMID 41767513

Laser Toning

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  • Retrospective records review, Singapore, no control group: A 2017 Singapore retrospective review found all 23 women toned three times weekly for two months developed mottled hypopigmentation; none of 13 followed up repigmented at four months.Tian B The Asian Problem of Frequent Laser Toning for Melasma. J Clin Aesthet Dermatol. 2017;10(7):40-42. View source
  • Retrospective review, Korean patients: A 2018 Korean retrospective review of 40 melasma patients found mean mMASI fell 54.23% after low-fluence Q-switched laser; two developed mottled hypopigmentation and rebound hyperpigmentation.Choi JE, Lee DW, Seo SH, Ahn HH, Kye YC Low-fluence Q-switched Nd:YAG laser for the treatment of melasma in Asian patients. J Cosmet Dermatol. 2018;17(6):1053-1058. View source · DOI

Picosecond Laser

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  • Cohort: A 2024 prospective study of 12 Chinese patients given one treatment reported mean freckle clearance of 74.46%; at eight weeks, one had hyperpigmentation and one had hypopigmentation.Huang Y, et al. Successful Treatment of Freckles Using a 730-nm Picosecond Laser: A Prospective Study. Clin Cosmet Investig Dermatol. 2024;17:3027-3032. View source · DOI · PMID 39741582
  • RCT: A 2023 randomised split-face pilot of 31 Asian patients reported scar score reductions of 39.11% with picosecond laser and 43.73% with Er:YAG, and pigmentation in 1 versus 8 sides.Dai R, et al. Comparison of 1064-nm Nd:YAG picosecond laser using fractional micro-lens array vs. ablative fractional 2940-nm Er:YAG laser for the treatment of atrophic acne scar in Asians: a 20-week prospective, randomized, split-face, controlled pilot study. Front Med (Lausanne). 2023;10:1248831. View source · DOI · PMID 38034535

Long-Pulsed 755 nm and 1064 nm Lasers

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  • RCT: A 2008 randomised trial with 15 completers reported 73.6% to 84.3% leg hair reduction at 18 months, no significant difference among treatments, and more adverse effects with combination therapy.Davoudi SM, et al. Comparison of Long-Pulsed Alexandrite and Nd:YAG Lasers, Individually and in Combination, for Leg Hair Reduction: An Assessor-Blinded, Randomized Trial With 18 Months of Follow-up. Arch Dermatol. 2008;144(10):1323-1327. View source · DOI · PMID 18936396
  • Cohort: A 2001 study of 20 women with phototypes IV to VI reported 70% to 90% hair reduction 12 months after three treatments, with mild to moderate discomfort and rare blistering.Alster TS, et al. Long-Pulsed Nd:YAG Laser-Assisted Hair Removal in Pigmented Skin: A Clinical and Histological Evaluation. Arch Dermatol. 2001;137(7):885-889. View source · DOI
  • Narrative review: A 2023 narrative review, with no patient sample, described the 755 nm alexandrite laser as absorbed by melanin and haemoglobin and used for hair removal, vascular and pigmented lesions.Chen C, Ke Y Applications of Long-Pulse Alexandrite Laser in Cosmetic Dermatology: A Review. Clin Cosmet Investig Dermatol. 2023;16:3349-3357. View source · DOI · PMID 38021435

Long-Pulsed Laser for Laxity

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  • Randomised split-face study: A 2015 study of 20 Korean subjects measured a 45.1% fall in mean wrinkle grade on the treated side of the face, four weeks after three sessions of long-pulsed 1064 nm laser, and biopsies showed more collagen and elastic fibre in the papillary dermis.Hong JS, Park SY, Seo KK, et al. Long pulsed 1064 nm Nd:YAG laser treatment for wrinkle reduction and skin laxity: evaluation of new parameters. Int J Dermatol. 2015;54(9):e345-50. DOI · PMID 25515708
  • Split-face study: A 2007 study of 12 patients compared one long-pulsed 1064 nm session with one radiofrequency session on a blinded photo panel. Overall improvement was scored at 47.5% for laser and 29.8% for radiofrequency, while the upper face was about equal and the lower-face difference was not significant. The author called for further controlled studies.Key DJ. Single-treatment skin tightening by radiofrequency and long-pulsed, 1064-nm Nd: YAG laser compared. Lasers Surg Med. 2007;39(2):169-75. DOI · PMID 17311271
  • Split-face trial: A 2006 study compared long-pulse 1064 nm and radiofrequency with six blinded observers. Wrinkles and laxity were rated as improved more on the laser side, and the authors call the improvement from one treatment modest.Taylor MB, Prokopenko I. Split-face comparison of radiofrequency versus long-pulse Nd-YAG treatment of facial laxity. J Cosmet Laser Ther. 2006;8(1):17-22. DOI · PMID 16581680
  • Pilot study: A 2012 study of 116 Korean patients used separate groups for long-pulsed 755 nm and 1064 nm laser. In the 1064 nm group 36% reported good or excellent skin tightening, and the 755 nm result concerned pigment.Lee YB, Shin JY, Cheon MS, et al. Photorejuvenation using long-pulsed alexandrite and long-pulsed neodymium:yttrium-aluminum-garnet lasers: a pilot study of clinical outcome and patients' satisfaction in Koreans. J Dermatol. 2012;39(5):425-9. DOI · PMID 22220934
  • Randomised comparison: A 2016 study compared dual-wavelength long-pulsed 755 nm and 1064 nm laser with pulsed dye laser for rosacea. It measured redness, not tightening. No study was found that used this pairing for skin tightening or laxity.Seo HM, Kim JI, Kim HS, et al. Prospective Comparison of Dual Wavelength Long-Pulsed 755-nm Alexandrite/1,064-nm Neodymium:Yttrium-Aluminum-Garnet Laser versus 585-nm Pulsed Dye Laser Treatment for Rosacea. Ann Dermatol. 2016;28(5):607-14. DOI · PMID 27746641

Laser Heat, Fat and Microliposuction

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  • Human tissue study: A 2017 three-part study of a 1,060 nm laser reached and held 42 to 47 °C in subcutaneous fat with surface cooling. In 6 subjects, mean fat thickness fell 18% at 6 months. It did not study the face, and two of the three authors list Cynosure, Inc. as their affiliation.Decorato JW, Chen B, Sierra R. Subcutaneous adipose tissue response to a non-invasive hyperthermic treatment using a 1,060 nm laser. Lasers Surg Med. 2017;49(5):480-489. DOI · PMID 28103642
  • Clinical study: In a 2018 multicentre study, 49 subjects had one 1,060 nm diode laser treatment on one flank, and ultrasound showed a mean fat reduction of 2.6 mm.Katz B, Doherty S. Safety and Efficacy of a Noninvasive 1,060-nm Diode Laser for Fat Reduction of the Flanks. Dermatol Surg. 2018;44(3):388-396. DOI · PMID 28902034
  • Clinical trial: In a 2018 two-centre study, 35 subjects had one 1,060 nm diode laser treatment on the abdomen, and fat thickness fell by 2.65 mm at 12 weeks. These 1,060 nm lasers are different devices from a long-pulsed 1064 nm laser, so these results do not apply to Time Freeze Laser LCLR® or to the face. No study was found of an external long-pulsed 1064 nm laser reducing facial or submental fat.Bass LS, Doherty ST. Safety and Efficacy of a Non-Invasive 1060 nm Diode Laser for Fat Reduction of the Abdomen. J Drugs Dermatol. 2018;17(1):106-112. PMID 29320595
  • Retrospective series: A 2026 series of 38 women had MRI-guided microliposuction for excess forehead fat graft. The forehead contour measured flatter after surgery and satisfaction was high. All had temporary upper-eyelid swelling, and 2 of 38 had short-term nerve problems that resolved.Huang Z, Zhang X, Jiang C, et al. Forehead Overfilling After Autologous Fat Grafting: Literature Review and Retrospective Evaluation of MRI-Guided Microliposuction for Revision. Aesthetic Plast Surg. 2026;50(11):4151-4166. DOI · PMID 41991798

Collagen Stimulator Nodules

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  • Case collection: A 2024 Brazilian collection of 55 complications found nodules in 89.1%. Treatments included saline, hyaluronidase, diluted corticosteroids and energy-based devices, and only five cases resolved completely. The authors felt the problems related more to product properties than to technique.Ianhez M, de Goés e Silva Freire G, Sigrist RMS, et al. Complications of collagen biostimulators in Brazil: Description of products, treatments, and evolution of 55 cases. J Cosmet Dermatol. 2024;23(9):2829-2835. View source · DOI · PMID 38693639
  • Systematic review: A 2025 review of 40 studies and 117 patients with granulomas after long-lasting fillers found steroid injection the most used treatment, at 21.37%, while symptoms were often resolved through surgical removal.Wang H, Wu D, Lo C, et al. Foreign Body Granulomas Reaction Related to Collagen Stimulatory Cosmetic Fillers: A Systematic Review. J Cosmet Dermatol. 2025;24(10):e70459. View source · DOI · PMID 41132036
  • Retrospective review: A 2020 review of 1,111 Ellansé treatments by one dermatologist recorded no nodules or granulomas, and temporary palpable lumps in 0.45%. There was no histology, and the authors accept some late events may have gone unreported, so this does not mean nodules cannot occur.Lin SL, Christen MO. Polycaprolactone-based dermal filler complications: A retrospective study of 1111 treatments. J Cosmet Dermatol. 2020;19(8):1907-1914. View source · DOI · PMID 32485052
  • Narrative review: A 2014 review says PLLA papules and nodules typically appear weeks after injection and usually resolve on their own, and that granulomas are separate and very rare.Vleggaar D, Fitzgerald R, Lorenc ZP. Understanding, Avoiding, and Treating Potential Adverse Events Following the Use of Injectable Poly-L-Lactic Acid for Facial and Nonfacial Volumization. J Drugs Dermatol. 2014;13(4 Suppl):s35-9. View source · PMID 24719076
  • Narrative review: A 2009 review gives intralesional corticosteroid as the treatment of choice for granulomas, with surgical excision as the last option.Lemperle G, Gauthier-Hazan N. Foreign Body Granulomas after All Injectable Dermal Fillers: Part 2. Treatment Options. Plast Reconstr Surg. 2009;123(6):1864-73. View source · DOI · PMID 19483588
  • Narrative review: A 2024 review discusses hyaluronidase for hyaluronic acid only, sodium thiosulfate for slow CaHA breakdown, and no on-demand method for polylactic acid.Wollina U, Goldman A. Spontaneous and induced degradation of dermal fillers: A review. J Cutan Aesthet Surg. 2024;17(4):273-281. View source · DOI · PMID 39649762
  • Case report: A 2025 report of one woman describes firm PDLLA nodules under the eye treated with monopolar radiofrequency, with no control or biopsy.Seo SB, Wan J, Yi KH. Energy-Based Device Management of Nodular Reaction Following Poly-D, L-Lactic Acid Injection for Tear Trough Rejuvenation. J Cosmet Dermatol. 2025;24(1):e16575. View source · DOI · PMID 39283001
  • Case series: A 2018 series of 81 patients had PMMA lumps removed with a 1,064 nm laser fibre under the skin and suction. 86.4% were satisfied, and it was uncontrolled. This is a different procedure from a surface laser, and it does not apply to PCL, PLLA, CaHA or PDLLA.Goldman A, Wollina U. Intralesional Neodymium YAG laser to Treat Complications of Polymethylmethacrylate. Open Access Maced J Med Sci. 2018;6(9):1636-1641. View source · DOI · PMID 30337979
  • Case series and literature table: A 2026 report of 4 women, with a table of 11 earlier studies, shows how thin this field is. None of the 11 studies used 1064 nm laser on filler, and the report's own two laser cases were nodules after mesotherapy, not filler.Wang J, Gu J, Wang Z, et al. Efficacy and Safety of Extracorporeal Shock Wave Therapy and 1064 nm Nd:YAG Laser in Managing Nodules and Edema Following Cosmetic Injections: A Case Series and Systematic Literature Review. J Cosmet Dermatol. 2026;25(5):e70883. View source · DOI · PMID 42087490

Overfilled Face

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  • Narrative review: A 2024 review describes facial overfilled syndrome as distorted contours from volume overload, caused by incorrectly placed or excessive filler and poor product choice.Lim T. Facial Overfilled Syndrome. Dermatol Clin. 2024;42(1):121-128. View source · DOI · PMID 37977678
  • Narrative review: A 2024 review attributes facial overfilled syndrome to excessive filler and suboptimal injection technique, and says skeletal structure and soft-tissue distribution play a significant role.Lim TS, Wanitphakdeedecha R, Yi KH. Exploring facial overfilled syndrome from the perspective of anatomy and the mismatched delivery of fillers. J Cosmet Dermatol. 2024;23(6):1964-1968. View source · DOI · PMID 38369859
  • Case series: A 2023 series of 28 patients found filler in the subdermal fat in 35.7% and deep supra-periosteal fat in 28.6%, and used ultrasound-targeted hyaluronidase at a mean of 81.6 IU.Schelke L, Harris S, Cartier H, et al. Treating facial overfilled syndrome with impaired facial expression—Presenting clinical experience with ultrasound imaging. J Cosmet Dermatol. 2023;22(12):3252-3260. View source · DOI · PMID 37772766
  • MRI series: A 2024 MRI series found hyaluronic acid filler visible in all 33 patients at least two years after injection, in one case up to 15 years.Master M, Azizeddin A, Master V. Hyaluronic Acid Filler Longevity in the Mid-face: A Review of 33 Magnetic Resonance Imaging Studies. Plast Reconstr Surg Glob Open. 2024;12(7):e5934. View source · DOI · PMID 39015357

Planning and Technique

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  • Narrative review: A 2018 review groups the causes of hyaluronic acid filler complications as patient, product and procedure related.Heydenrych I, Kapoor KM, De Boulle K, et al. A 10-point plan for avoiding hyaluronic acid dermal filler-related complications during facial aesthetic procedures and algorithms for management. Clin Cosmet Investig Dermatol. 2018;11:603-611. View source · DOI · PMID 30538521
  • Consensus review: A 2015 review states that the majority of complications are related to sterility, placement, volume and injection technique.De Boulle K, Heydenrych I. Patient factors influencing dermal filler complications: prevention, assessment, and treatment. Clin Cosmet Investig Dermatol. 2015;8:205-14. View source · DOI · PMID 25926750
  • Global consensus: A 2016 consensus on hyaluronic acid fillers, which reviewed two named product lines, states that most adverse events from these fillers can be avoided with proper planning and technique.Signorini M, Liew S, Sundaram H, et al. Global Aesthetics Consensus: Avoidance and Management of Complications from Hyaluronic Acid Fillers—Evidence- and Opinion-Based Review and Consensus Recommendations. Plast Reconstr Surg. 2016;137(6):961e-971e. View source · DOI · PMID 27219265
  • Narrative review: A 2015 review says satisfaction with focused ultrasound rises with proper patient selection and realistic expectations, and reports greater lifting with more lines at higher energy at two depths.Fabi SG. Noninvasive skin tightening: focus on new ultrasound techniques. Clin Cosmet Investig Dermatol. 2015;8:47-52. View source · DOI · PMID 25709486
  • Prospective study: A 2012 study found that lift varied with line direction, line number, depth and energy on the same focused ultrasound device.Sasaki GH, Tevez A. Clinical efficacy and safety of focused-image ultrasonography: a 2-year experience. Aesthet Surg J. 2012;32(5):601-12. DOI · PMID 22531061
  • Physician survey: A 2007 survey of 5,700 monopolar radiofrequency treatments reported immediate tightening in 26% with an older high-energy method and 87% with a lower-energy, multiple-pass method. There was no control group.Dover JS, Zelickson B; 14-Physician Multispecialty Consensus Panel. Results of a survey of 5,700 patient monopolar radiofrequency facial skin tightening treatments: assessment of a low-energy multiple-pass technique leading to a clinical end point algorithm. Dermatol Surg. 2007;33(8):900-7. DOI · PMID 17661932

Facial Anatomy

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  • Cadaver study: A 2007 dissection of 30 hemifaces found facial fat divided into separate compartments, including a discrete nasolabial unit and jowl fat.Rohrich RJ, Pessa JE. The Fat Compartments of the Face: Anatomy and Clinical Implications for Cosmetic Surgery. Plast Reconstr Surg. 2007;119(7):2219-27. View source · DOI · PMID 17519724
  • Narrative review: A 2016 review describes the face as layers of bone, ligaments, muscles, fat and skin, and says ageing affects all of them at different rates.Cotofana S, Fratila AA, Schenck TL, et al. The Anatomy of the Aging Face: A Review. Facial Plast Surg. 2016;32(3):253-60. View source · DOI · PMID 27248022
  • Cadaver study: A 2008 dissection of 16 hemifaces described a mandibular septum that tethers skin to the jaw border and separates jowl fat from neck fat.Reece EM, Pessa JE, Rohrich RJ. The Mandibular Septum: Anatomical Observations of the Jowls in Aging—Implications for Facial Rejuvenation. Plast Reconstr Surg. 2008;121(4):1414-20. View source · DOI · PMID 18349664
  • Anatomical study: A 2023 study of 49 cadaver heads described the jowl as a local area of redundant skin and subcutaneous fat, attributed to connective tissue that lengthens with ageing.Minelli L, Yang HM, van der Lei B, Mendelson B. The Surgical Anatomy of the Jowl and the Mandibular Ligament Reassessed. Aesthetic Plast Surg. 2023;47(1):170-180. View source · DOI · PMID 36050569
  • Cadaver study: A 1992 dissection study found that the nasolabial fold varies in type, and described it as a conflict between the skin and fat envelope and the muscles beneath.Zufferey J. Anatomic Variations of the Nasolabial Fold. Plast Reconstr Surg. 1992;89(2):225-31. View source · DOI · PMID 1732888
  • Narrative review: A 2021 review says submental fullness can come from fat above or below the platysma, and from the digastric muscles and submandibular glands.Weinstein AL, Nahai F. A layered approach to neck lift. Plast Aesthet Res. 2021;8:11. View source · DOI

Ultrasound Mapping of Filler

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  • Narrative review: A 2015 review calls sonography the first-line imaging for cosmetic fillers and their complications.Wortsman X. Identification and Complications of Cosmetic Fillers: Sonography First. J Ultrasound Med. 2015;34(7):1163-72. View source · DOI · PMID 26112618
  • Imaging study: A 2017 study described polycaprolactone on ultrasound as hypoechoic deposits with bright spots and a mini-comet-tail artefact, unlike other common fillers.Wortsman X, Quezada N. Ultrasound Morphology of Polycaprolactone Filler. J Ultrasound Med. 2017;36(12):2611-2615. View source · DOI · PMID 28703420
  • Prospective imaging study: A 2023 study of 27 referred patients with non-inflammatory nodules found the nodule inside the fascia in every case.Schelke LW, Decates TS, Cartier H, Cotofana S, Velthuis PJ. Investigating the Anatomic Location of Soft Tissue Fillers in Noninflammatory Nodule Formation: An Ultrasound-Imaging-Based Analysis. Dermatol Surg. 2023;49(6):588-595. View source · DOI · PMID 36942950
  • Delphi consensus: A 2025 panel of 15 specialists called pre-injection ultrasound mandatory in certain high-risk areas and for managing complications, and advised identifying earlier filler before injecting.Velthuis PJ, Alfageme F, Cartier H, et al. The use of ultrasound imaging in aesthetic injectables: A modified Delphi consensus. J Plast Reconstr Aesthet Surg. 2025;104:33-37. View source · DOI · PMID 40101353
  • Multicentre study: A 2025 study of 240 granuloma cases found the lower lid, infraorbital area and medial cheek to be the main region, at 41.7%, and the hypodermis the layer most often involved.Wortsman X, Valderrama Y, Ortiz-Orellana G, et al. International Multicentric Study on Ultrasound Characteristics, Layer Location, and Corporal Distribution of Granulomas After Cosmetic Fillers Injections. J Ultrasound Med. 2025;44(8):1447-1455. View source · DOI · PMID 40186407

Laser Hair Removal

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  • Systematic review: A 2024 systematic review of six studies and 423 women with PCOS reported alexandrite laser outperforming intense pulsed light, with low certainty of evidence and few studies in skin of colour.Tan K, et al. Laser and Light-Based Therapies for Hirsutism Management in Women With Polycystic Ovarian Syndrome: A Systematic Review. JAMA Dermatol. 2024;160(7):746-757. View source · DOI · PMID 38630483
  • Narrative review: A 2022 narrative review, with no patient sample, stated facial laser hair reduction outcomes depend on three factors: proper patient selection, a suitable laser system and an experienced operator.Goel A, Rai K Methods to Overcome Poor Response and Challenges of Facial Laser Hair Reduction. J Clin Aesthet Dermatol. 2022;15(6):38-41. View source · PMID 35783561

Tattoo Removal

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  • Within-tattoo comparison: A 1998 within-tattoo comparison of 16 patients with black tattoos reported picosecond-treated areas lightening significantly more than nanosecond-treated areas in 12 of 16 tattoos.Ross EV, et al. Comparison of Responses of Tattoos to Picosecond and Nanosecond Q-Switched Neodymium:YAG Lasers. Arch Dermatol. 1998;134(2):167-171. View source · DOI · PMID 9487208
  • RCT: A 2017 randomised trial of 21 patients with 30 black tattoos found no clearance difference between picosecond and nanosecond lasers (P=1.00), with pain 3.8 versus 7.9 out of 10.Pinto F, et al. Neodymium-doped yttrium aluminium garnet (Nd:YAG) 1064-nm picosecond laser vs. Nd:YAG 1064-nm nanosecond laser in tattoo removal: a randomized controlled single-blind clinical trial. Br J Dermatol. 2017;176(2):457-464. View source · DOI · PMID 27518129

Rosacea and Vascular Laser

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  • Systematic review: A 2022 meta-analysis of 10 articles reported over 50% clearance in 68.6% with pulsed dye laser and 71.4% with Nd:YAG, a non-significant difference (RR 0.94, pooled from only two studies).Li Y, Wang R Efficacy Comparison of Pulsed Dye Laser vs. Microsecond 1064-nm Neodymium:Yttrium-Aluminum-Garnet Laser in the Treatment of Rosacea: A Meta-Analysis. Front Med (Lausanne). 2022;8:798294. View source · DOI
  • Cohort: A 2026 retrospective study of 120 patients reported effective rates of 57.50% pulsed dye laser, 45.00% IPL and 67.50% radiofrequency, not significantly different; adverse reactions occurred in 100%, 27.5% and 5%.Chen X, et al. Comparison of the Efficacy and Safety of Pulsed Dye Laser, Intense Pulsed Light and Radiofrequency Therapy in the Treatment of Erythematotelangiectatic Rosacea. Clin Cosmet Investig Dermatol. 2026;19:1-11 (article 562732). View source · DOI · PMID 41835963
  • Case series: A 2015 case series of 66 patients reported good to excellent improvement in up to half of both rosacea subtype groups, with hypopigmented atrophic scars in two patients.Say EM, et al. Treatment Outcomes of Long-Pulsed Nd: YAG Laser for Two Different Subtypes of Rosacea. J Clin Aesthet Dermatol. 2015;8(9):16-20. View source · PMID 26430486

Enlarged Pores

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  • Prospective randomized split-face trial, Asians: A 2020 randomized split-face trial of 25 Asians found pore index fell 41.3% with picosecond laser but rose 3.9% with quasi-long-pulsed laser; picosecond treatment hurt more.Yim S, Lee YH, Choi YJ, Kim WS Split-face comparison of the picosecond 1064-nm Nd:YAG laser using a microlens array and the quasi-long-pulsed 1064-nm Nd:YAG laser for treatment of photoaging facial wrinkles and pores in Asians. Lasers Med Sci. 2020;35(4):949-956. View source · DOI
  • Randomized split-face controlled trial: A 2024 randomized split-face trial of 25 people found pore counts fell with picosecond and 1565-nm fractional lasers, without significant difference; pain scored 4.11 versus 4.83.Liu X, Zeng R, Liu Y, Guo L, Zhang M, Zheng H, Wu Q, Ge Y, Lin T Comparison of the 1064-nm picosecond laser with fractionated microlens array and 1565-nm non-ablative fractional laser for the treatment of enlarged pores: a randomized, split-face, controlled trial. Lasers Med Sci. 2024;39(1):80. View source · PMID 38396012

Dark Underarms

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  • Systematic review: A 2025 systematic review found only ten studies on axillary hyperpigmentation; Q-switched Nd:YAG laser was reported effective across three of them.Vahabi SM, Sajjadi S, Kalantari Y, Pourgholi E, Heidari S, Etesami I Axillary Hyperpigmentation Treatment: A Systematic Review of the Literature. J Cosmet Dermatol. 2025;24(8):e70418. View source · DOI
  • Randomized split-side trial, Thailand: A 2021 Thai randomized split-side trial of 22 subjects found IPL and Q-switched Nd:YAG both lightened underarms after three sessions, without significant difference; side effects, seen only after IPL, were transient.Amornpetkul W, Kanokrungsee S, Kamanamool N, Udompataikul M, Rojhirunsakool S Comparison between the use of intense pulsed light and Q-switched neodymium-doped yttrium aluminum garnet laser for the treatment of axillary hyperpigmentation. J Cosmet Dermatol. 2021;20(9):2785-2793. View source · DOI

Stretch Marks

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  • Systematic review and meta-analysis of controlled studies: A 2024 meta-analysis of 11 studies found microneedling for stretch marks did not differ from laser on improvement (P=0.35) and caused significantly more pain, with less hyperpigmentation than other treatments.Sun X, Jia X, Huang L Microneedling Therapy for Striae Distensae: Systematic Review and Meta-Analysis. Aesthetic Plast Surg. 2024. View source · DOI · PMID 38509316
  • Systematic review: A 2021 systematic review of 100 articles found most stretch-mark treatments about equally effective, with no significant side-effect difference; combinations usually outperformed single modalities.Seirafianpour F, Sodagar S, Mozafarpoor S, Baradaran HR, Panahi P, Hassanlouei B, Goodarzi A Systematic review of single and combined treatments for different types of striae: A comparison of striae treatments. J Eur Acad Dermatol Venereol. 2021;35(11):2184-2198. View source · DOI

Keloids and Raised Scars

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  • Network meta-analysis of RCTs: A 2026 network meta-analysis of 24 trials found only triamcinolone plus 5-fluorouracil significantly cut recurrence versus triamcinolone (OR 0.33); botulinum toxin ranked highest for response, without reducing recurrence.Lai IC, Huang GL, Lee KC, Wu PY Comparative Efficacy and Recurrence Risk of Intralesional Therapies for Hypertrophic Scars and Keloids: A Network Meta-Analysis. Aesthet Surg J. 2026;46(2):202-212. View source · DOI · PMID 40972598
  • Network meta-analysis of RCTs: A 2021 network meta-analysis of 29 studies and 2,009 patients ranked triamcinolone plus botulinum toxin first (SUCRA 82.2%), though follow-up was short, 12 weeks to 24 months.Yang S, Luo YJ, Luo C Network Meta-Analysis of Different Clinical Commonly Used Drugs for the Treatment of Hypertrophic Scar and Keloid. Front Med (Lausanne). 2021;8:691628. View source · DOI · PMID 34568361
  • International e-Delphi expert consensus: A 2024 international Delphi consensus of 23 keloid experts preferred triamcinolone 40 mg/mL for non-facial keloids, at up to 80 mg monthly, stating this rests on expert opinion, not strong evidence.Yin Q, Wolkerstorfer A, Lapid O, et al. KECORT Study: An International e-Delphi Study on the Treatment of KEloids Using Intralesional CORTicosteroids in Clinical Practice. Am J Clin Dermatol. 2024;25:1009-1017. View source · DOI
  • Scoping review of RCTs: A 2023 scoping review of 38 keloid trials found triamcinolone in 97.4%, doses of 1 to 20 mg per cm2 in the ten trials that reported them, and only six trials following patients six months or more.Yin Q, Louter JMI, Niessen FB, Gibbs S, Tasdemir-Kilic G, Lapid O, van Zuijlen PPM, Wolkerstorfer A Intralesional corticosteroid administration in the treatment of keloids: a scoping review on injection methods. Dermatology. 2023. View source · PMID 36657423

Moles and Melanoma

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  • Cochrane diagnostic test accuracy review: A 2018 Cochrane review of 42,788 lesions estimated 92% sensitivity with in-person dermoscopy versus 76% by eye alone, at fixed 80% specificity; figures illustrative, mostly referral settings.Dinnes J, et al. Dermoscopy, with and without visual inspection, for diagnosing melanoma in adults. Cochrane Database Syst Rev. 2018;CD011902. View source · DOI
  • Retrospective single-centre review, Singapore: A 2021 Singapore single-centre review of 62 invasive melanomas found acral lentiginous melanoma the commonest subtype in Asians (44.0%); 28% of Asians presented at stage III or IV.Yeo PM, Lim ZV, Tan WDV, Zhao X, Chia HY, Tan SH, Teo MCC, Tan MWP Melanoma in Singapore: A 20-year review of disease and treatment outcomes. Ann Acad Med Singap. 2021;50(6):456-466. View source · DOI

Warts

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  • Network meta-analysis of RCTs: A 2024 network meta-analysis of 27 trials and 2,539 participants with palmoplantar warts ranked needling highest for cure; cryotherapy had the highest recurrence odds.Alrashidi A, Shaheen E, Abualola A, Alharkan AA, Aljuaid A, Alshareef KM, Ghaddaf AA, Alamri S, Samarkandy SJ The efficacy of cryotherapy compared to the other modalities for the management of palmoplantar warts: a systematic review and network meta-analysis. Dermatol Reports. 2024. View source · DOI
  • Systematic review and meta-analysis of RCTs: A 2024 meta-analysis of 24 trials found that intralesional Candida antigen raised complete wart clearance over saline (11 saline-controlled trials, risk ratio 5.39, 95% CI 3.49-8.33), though signs of publication bias lowered the adjusted estimate to about 4.4.Chang CH, Sung ZY, Huang YC Efficacy of Intralesional Candida Injection in the Treatment of Cutaneous Warts: A Systematic Review and Meta-Analysis. Acta Derm Venereol. 2024;104:adv40819. View source · DOI

Skin Tags

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  • RCT, one over-the-counter device versus another: A 2021 randomized trial of 56 volunteers found 64.3% of tags cleared with one cryogenic home device versus 7.1% with another; it did not test clinic procedures.Antunes A, Rossel B, Adriaens E Efficacy Evaluation of the Pixie Skin Tag Cryogenic Device on Skin Tags in a Prospective, Single-Blinded, Randomized, Comparative Clinical Trial. Dermatol Ther (Heidelb). 2021;11(3):995-1007. View source · DOI
  • Prospective within-person randomized comparison: A 2020 within-person randomized study of 10 participants scored pain 0.4 with cryotherapy versus 4.6 with electrocoagulation; appearance at 30 days favoured electrocoagulation in 80.95% of comparisons.Trevisan F, Kalkmann GF, Nascimento IP, Batista Filho EL Pain tolerance and aesthetic result of removing acrochordons with contact cryotherapy compared to electrocoagulation. Surg Cosmet Dermatol. 2020;12(3):258-263. View source · DOI

Botulinum Toxin

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  • Systematic review: A 2009 systematic review of 11 randomised trials and 1,603 subjects reported wrinkle improvement lasting about 4 to 6 months, with blepharoptosis in 0% to 5.4% after glabellar treatment.Gadhia K, Walmsley AD Facial aesthetics: is botulinum toxin treatment effective and safe? A systematic review of randomised controlled trials. Br Dent J. 2009;207(5):E9. View source · DOI · PMID 19749689
  • Narrative review: A 2021 review of five studies, with Galderma-funded writing, reported about 9 months' median duration at 2 to 2.5-fold abobotulinumtoxinA or 5-fold incobotulinumtoxinA on-label doses.Kaufman-Janette J, et al. Botulinum Toxin Type A for Glabellar Frown Lines: What Impact of Higher Doses on Outcomes?. Toxins (Basel). 2021;13(7):494. View source · DOI · PMID 34357966

Masseter Injections

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  • RCT: A 2026 AbbVie-linked trial of 376 adults reported 51.2% on onabotulinumtoxinA versus 2.2% on placebo improving at least two grades at day 90; adverse events affected 44.5% versus 35.5%.Sun J, et al. OnabotulinumtoxinA Treatment for Masseter Muscle Prominence: 6-Month Safety and Efficacy Results, Including Patient-Reported Outcomes, From a Phase 3, Randomized, Placebo-Controlled, Multiregional Trial. Aesthet Surg J. 2026;46(5):486-494. View source · DOI · PMID 41092464
  • Narrative review: A 2023 Allergan-funded narrative review, with no study sample, described reported side effects including reduced bite force, injection-site pain, headache and sunken cheeks, mostly mild and transient.Wu Y, et al. Botulinum Toxin Type A for the Treatment of Masseter Muscle Prominence in Asian Populations. Aesthet Surg J Open Forum. 2023;5:ojad005. View source · DOI · PMID 36998746
  • RCT: A 2022 randomised trial of 30 volunteers reported lower-face height reduction of 2.17 mm with toxin alone and 1.99 mm with an oral appliance at 24 weeks, a similar level.Park Y, et al. Combined Effects of Botulinum Toxin Injection and Oral Appliance Therapy on Lower Facial Contouring: A Randomized Controlled Trial. J Clin Med. 2022;11(14):4092. View source · DOI · PMID 35887855

Filler Safety

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  • Consensus: A 2015 expert consensus, not a trial, recommended at least 200 U of hyaluronidase, more if no improvement within 60 minutes, and said early treatment within 24 hours usually gave better outcomes.Cohen JL, et al. Treatment of Hyaluronic Acid Filler-Induced Impending Necrosis With Hyaluronidase: Consensus Recommendations. Aesthet Surg J. 2015;35(7):844-849. View source · DOI · PMID 25964629
  • Consensus: A 2020 multinational expert consensus called visual loss from hyaluronic acid filler rare (estimated under 1 in 100,000 syringes) but catastrophic, and set out recommendations on consent, prevention and early management.Goodman GJ, et al. A Consensus on Minimizing the Risk of Hyaluronic Acid Embolic Visual Loss and Suggestions for Immediate Bedside Management. Aesthet Surg J. 2020;40(9):1009-1021. View source · DOI · PMID 31693068
  • Narrative review: A 2024 narrative review, with no pooled sample, described filler vascular complications from compression or vessel blockage and named the nasolabial folds and nasal region as most susceptible.Hong GW, et al. Adverse Effects Associated with Dermal Filler Treatments: Part II Vascular Complication. Diagnostics (Basel). 2024;14(14):1555. View source · DOI · PMID 39061692

Filler Vascular Occlusion

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  • Retrospective multicentre observational study, Japan: A 2023 Japanese multicentre review of 41,775 filler patients found 29 early complications, 18 vascular compromise, without skin necrosis; data came from one clinic group and excluded late events.Nishikawa A, Aikawa Y, Kono T Current Status of Early Complications Caused by Hyaluronic Acid Fillers: Insights From a Descriptive, Observational Study of 41,775 Cases. Aesthet Surg J. 2023;43(8):893-904. View source · DOI · PMID 36840507
  • Systematic review, qualitative synthesis: A 2026 systematic review of 91 studies, mostly case reports and case series, found skin ischemia most frequent; ocular and neurological events were rarer but often permanent; evidence certainty was limited.Sardellitti L, Pirino A, Di Palma A, Filigheddu E, Milia EP Vascular Occlusion Following Dermal Filler Injections: A Systematic Review of Clinical Evidence and Emergency Management. Oral. 2026;6(3):51. View source · DOI

Ultrasound-Guided Filler Work

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  • Case series: A 2023 retrospective case series of 39 patients, all flooded first, reported a mean 122.5 IU hyaluronidase with ultrasound-guided targeting versus 1519.4 IU with flooding (level of evidence 4).Schelke LW, et al. Ultrasound-Guided Targeted vs Regional Flooding: A Comparative Study for Improving the Clinical Outcome in Soft Tissue Filler Vascular Adverse Event Management. Aesthet Surg J. 2023;43(1):86-96. View source · DOI · PMID 35951759
  • Case series: A 2024 preliminary case series of 5 women found the 4 treated promptly fully recovered and the fifth, treated later, markedly improved, with a mean of 87 IU hyaluronidase across all five under ultrasound.Urso SU, et al. Use of Minimal Amounts of Hyaluronidase in the Ultrasound-Guided Treatment of Acute Vascular Occlusion by Hyaluronic Acid: A Preliminary Report. Aesthet Surg J Open Forum. 2024;6:ojae025. View source · DOI · PMID 38938923
  • Narrative review: A 2023 narrative overview from 2 clinical centres in 2 countries described equipment choice and 2 techniques for ultrasound-guided filler injection, scanning before or while injecting, with no numerical outcomes.Vasconcelos-Berg R, et al. Doppler Ultrasound-Guided Filler Injections: Useful Tips to Integrate Ultrasound in Daily Practice. Aesthet Surg J. 2023;43(7):773-783. View source · DOI · PMID 36594153

Lip Filler

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  • Systematic review and meta-analysis: A 2021 meta-analysis of 10 studies and 1,228 participants reported lip volume responders of 91% at 2 months and 46% at one year; tenderness affected 88.7%.Czumbel LM, Farkasdi S, Gede N, Mikó A, Csupor D, Lukács A, Gaál V, Kiss S, Hegyi P, Varga G Hyaluronic Acid Is an Effective Dermal Filler for Lip Augmentation: A Meta-Analysis. Front Surg. 2021;8:681028. View source · DOI
  • Multicentre evaluator-blinded RCT, China: A 2022 randomized trial of 163 Chinese adults reported lip fullness improvement in 84.7% treated versus 0% untreated at three months; one arterial ischemia event resolved in 16 days.Li D, Gao Z, Sun J, Li Q, Jiang P, Zhang L, Chawla S Safe and Effective Lip Enhancement with VYC-15L in Chinese Adults. Clin Cosmet Investig Dermatol. 2022;15:2427-2436. View source

Tear Trough

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  • Systematic review: A 2021 systematic review of nine studies and 830 patients reported results lasting 6 to 12 months, mostly mild side effects, and a high risk of bias.D'Amato S, Fragola R, Bove P, Lo Giudice G, Gennaro P, Vitagliano R, Staglianò S Is the Treatment of the Tear Trough Deformity with Hyaluronic Acid Injections a Safe Procedure? A Systematic Review. Appl Sci. 2021;11:11489. View source · DOI
  • Systematic review: A 2022 systematic review of 23 articles and 2,048 patients reported effects lasting 8 to 12 months, a 30.2% adverse event rate and only one randomized trial.Trinh LN, Grond SE, Gupta A Dermal Fillers for Tear Trough Rejuvenation: A Systematic Review. Facial Plast Surg. 2022;38(3):228-239. View source · DOI · PMID 34192769

Dark Eye Circles

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  • Review of clinical trials: A 2025 review of 18 clinical trials and 619 participants found no single treatment emerged as the clear choice for periorbital hyperpigmentation.Santos MO, Sequeira ML, Silva R Is there a gold standard for treating periorbital hyperpigmentation? – A narrative review of the latest evidence. J Cutan Aesthet Surg. 2025;18(4):243-251. View source · DOI
  • Systematic review: A 2024 systematic review of 14 light-device studies favoured intense pulsed light or ruby laser with depigmenting agents; one CO2 laser study reported 46% post-inflammatory hyperpigmentation.Montolío-Marzo S, Montolío-Marzo E, Martínez-Gil C, Rodríguez-Iranzo G, Arias-García E, Pérez-López M Treatment of periorbital hyperpigmentation using light devices. Arch Soc Esp Oftalmol (Engl Ed). 2024;99(1):23-32. View source · DOI

Eye Bags

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  • Multicentre prospective observational study, no control group: A 2019 uncontrolled observational study of 120 patients reported 85.83% clinician-rated success with injected sodium deoxycholate for lower eyelid fat pads; adverse event rates were not quantified.Amore R, Sbarbati A, Amuso D, Leonardi V, Alsanafi S, Greco Lucchina A, Scarano A Non-surgical treatment of lower eyelid fat pads with an injectable solution acid deoxycholic based. J Biol Regul Homeost Agents. 2019;33(6 Suppl 2):109-114. View source · PMID 32425031
  • Randomized split-face trial, Chinese subjects, no untreated control: A 2021 Chinese randomized split-face trial of 15 subjects measured orbital fat depth falling from 10.2 to 8.0 mm with microneedle radiofrequency; the sample was small.Dou W, Yang Q, Yin Y, Fan X, Qiu L, Yang Z, Jian Z, Song W, Ma X A randomized, split-face controlled trial on the safety and effects of microneedle fractional radiofrequency and fractional erbium-doped glass 1,565-nm laser therapies for baggy lower eyelids. J Cosmet Laser Ther. 2021;23(5-6):105-112. View source · DOI · PMID 34812096

Droopy Eyelids

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  • Pooled analysis of four RCTs: A 2021 pooled analysis of four trials and 568 ptosis patients found adverse events in 31.2% on oxymetazoline drops versus 30.6% on vehicle; punctate keratitis affected 3.5% on oxymetazoline and 2.1% on vehicle.Wirta DL, Korenfeld MS, Foster S, Smyth-Medina R, Bacharach J, Kannarr SR, Jaros MJ, Slonim CB Safety of Once-Daily Oxymetazoline HCl Ophthalmic Solution, 0.1% in Patients with Acquired Blepharoptosis: Results from Four Randomized, Double-Masked Clinical Trials. Clin Ophthalmol. 2021;15:4035-4048. View source · DOI
  • Prospective clinical trial, uncontrolled: A 2025 prospective study of 13 subjects found blinded photo ratings of dermatochalasis improved after microplasma (P<0.01), with no serious adverse events; there was no control group.Hsu JTS Non-Surgical Correction of Dermatochalasis Using Microplasma. J Drugs Dermatol. 2025;24(2):134-141. View source · DOI
  • Pooled analysis of two phase 3 RCTs: A 2021 pooled analysis of two phase 3 trials and 304 ptosis patients found eyelid height rose 1.04 mm with oxymetazoline drops versus 0.47 mm with vehicle at day 42, measured 15 minutes after the drops.Bacharach J, Wirta DL, Smyth-Medina R, Korenfeld MS, Kannarr SR, Foster S, Jaros MJ, Slonim CB Rapid and Sustained Eyelid Elevation in Acquired Blepharoptosis with Oxymetazoline 0.1%: Randomized Phase 3 Trial Results. Clin Ophthalmol. 2021;15:2743-2751. View source · DOI

Cheek Filler

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  • RCT, double-blind, split-face, Korean adults: A 2021 Korean split-face randomized trial of 88 adults (69 followed to 104 weeks) reported mid-face responders of about 73% for two hyaluronic fillers at 104 weeks, with no serious adverse events.Jung JM, Lee WS, Yoon J, Paik SH, Han HS, Lee WJ, Chang SE, Won CH, Kim BJ A multicenter, randomized, double-blind comparison of two hyaluronic acid fillers in mid-face volume restoration in Asians: A 2-year extension study. Dermatol Ther. 2021;34(2):e14787. View source · DOI
  • Multicentre RCT, Chinese subjects: A 2017 Chinese randomized trial of 146 subjects measured 1.83 mL malar volume gain with filler versus 0.11 mL in controls at six months; swelling and bruising were commonest.Li D, Wang X, Wu Y, Sun J, Li Q, Guo S, Jia Y, Murphy DK A Randomized, Controlled, Multicenter Study of Juvéderm Voluma for Enhancement of Malar Volume in Chinese Subjects. Plast Reconstr Surg. 2017;139(6):1250e-1259e. View source · DOI · PMID 28538556

Chin Filler

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  • RCT, evaluator-blinded, Chinese adults: A 2024 randomized trial of 148 Chinese adults reported 81% chin retrusion responders with filler versus 5% untreated at 6 months; swelling affected 86%; manufacturer-funded.Xie Y, Zhao H, Wu W, et al. Chin Augmentation and Treatment of Chin Retrusion with a Flexible Hyaluronic Acid Filler in Asian Subjects: A Randomized, Controlled, Evaluator-Blinded Study. Aesthetic Plast Surg. 2024;48(5):1030-1036. View source · DOI
  • Phase III RCT, evaluator-blinded, China: A 2026 Chinese randomized trial of 144 participants reported 77.78% chin scale improvement at 60 weeks with PVA-HA filler; 86.11% had injection-site responses, and manufacturer staff co-authored it.Hong WJ, Ren JZ, Wang CY, Wang SW, Zhang K, Chen ZY, Zou MY, Cao JH, Niu HY, Luo SK Effectiveness and Safety of a Polyvinyl Alcohol Microsphere and Hyaluronic Acid Suspension for Chin Augmentation: A Randomized Controlled Trial and Multidisciplinary Study. Aesthet Surg J. 2026;46(5):NP33-NP44. View source · DOI · PMID 41305938

Jawline Filler

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  • Multicentre RCT, evaluator-blinded, no-treatment control: A 2025 multicentre randomized trial of 206 mostly White adults reported tenderness in 80.1% of jawline filler patients; funded by the manufacturer.Burgess C, Dayan S, Bank D, Weinkle S, Sartor M, Chawla S, Keaney T Hyaluronic Acid Filler VYC-25L for Jawline Restoration Yields High Satisfaction, Improved Jawline Measurements, and Sustained Effectiveness Across Skin Types, Age, and Gender for up to 12 Months. Aesthet Surg J. 2025;45(1):98-107. View source · DOI · PMID 39141784
  • Retrospective single-centre analysis: A 2021 retrospective single-centre study of 30 adults reported edema in 46.7% and bruising in 20.0% after lower-face filler.Bertossi D, Robiony M, Lazzarotto A, Giampaoli G, Nocini R, Nocini PF Nonsurgical Redefinition of the Chin and Jawline of Younger Adults With a Hyaluronic Acid Filler: Results Evaluated With a Grid System Approach. Aesthet Surg J. 2021;41(9):1068-1076. View source · DOI

Temple Filler

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  • Controlled clinical study, 2:1 versus untreated: A 2025 controlled study of 75 subjects reported temple hollowing improved versus untreated controls through 12 months with mean 4.72 mL; 10 subjects had treatment-related adverse events.Guo Y, Li P, Wei W, Li Q, Shen C, Zhuo X, Luo Y, Liu J, Jin P, Li X Safety and efficacy of the amino acid-crosslinked hyaluronic acid in the treatment of temple hollowing. Asian J Surg. 2025;48(2):1034-1040. View source · DOI
  • Uncontrolled case series with 3D and ultrasound follow-up: A 2024 uncontrolled ultrasound series of 25 women measured temple depression of 4.33 mm before filler, 0.71 mm at 3 months and 1.62 mm at 6 months.Kim JS Efficacy, Safety, and Longevity of Hyaluronic Acid Filler Injection in Treating Temple Hollowness by Sonographic Identifying 17 Soft Tissue Layers. Plast Reconstr Surg Glob Open. 2024;12(9):e6154. View source · DOI

Non-Surgical Rhinoplasty

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  • Systematic review and meta-analysis: A 2021 meta-analysis of 37 publications and 8,604 patients reported 2.52% adverse outcomes, including vessel occlusion in 0.35%, skin necrosis in 0.08% and vision loss in 0.09%.DeVictor S, Ong AA, Sherris DA Complications Secondary to Nonsurgical Rhinoplasty: A Systematic Review and Meta-analysis. Otolaryngol Head Neck Surg. 2021;165(5):611-616. View source · DOI
  • Systematic review: A 2020 systematic review of 23 studies and 1,600 patients reported 26 complications; most cases used hyaluronic acid.Williams LC, Kidwai SM, Mehta K, Kamel G, Tepper OM, Rosenberg JD Nonsurgical Rhinoplasty: A Systematic Review of Technique, Outcomes, and Complications. Plast Reconstr Surg. 2020;146(1):41-51. View source · DOI · PMID 32590640
  • Multicentre RCT, no-treatment control, China: A 2022 Chinese randomized trial of 157 adults measured 2.032 cm3 nose volume gain with filler versus -0.005 cm3 untreated at 24 weeks; injection responses mostly resolved within 14 days.Li D, Sun J, Zhang Y, Wang X, Yang S, Harvey C, Zhang L VYC-20L is Safe and Effective for Improving Volume and Aesthetic Appearance of the Nose in Chinese Adults. Clin Cosmet Investig Dermatol. 2022;15:1195-1204. View source · DOI

Neck Treatment

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  • Systematic review and meta-analysis: A 2026 meta-analysis of 11 studies and 379 participants found neck-line wrinkle grades improved by 1.43 (3 studies), with about 50% retreated within 12 months (2 studies) and a 14% complication rate; only one trial was randomized.Wong ZY, Limbu S, Karanasios G, Monks F, Faderani R, Kanapathy M, Mosahebi A Efficacy and Safety of Hyaluronic Acid Fillers for Horizontal Neck Lines: A Systematic Review and Meta-Analysis. Aesthet Surg J Open Forum. 2026;8:ojaf163. View source · DOI · PMID 41560960
  • Prospective observational study: A 2018 prospective observational study of 20 women found neck-line botulinum toxin peaked at 8 weeks, with mild reactions, though patient improvement and satisfaction did not exceed 50%.Lee JH, Park YG, Park ES A Prospective Observational Study of the Effectiveness and Safety of Botulinum Toxin in the Horizontal Neck Lines. Aesthetic Plast Surg. 2018. View source · DOI · PMID 29922842

Hand Filler

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  • RCT, evaluator-blinded, split-hand: A 2019 randomized split-hand trial of 90 subjects reported 85.9% response with hyaluronic acid versus 21.2% untreated at week 12; 7.9% had treatment-related adverse events, mostly mild.Moradi A, Allen S, Bank D, Marmur E, Fagien S, Glaser DA, Maguire C, Cohen JL A Prospective, Multicenter, Randomized, Evaluator-Blinded, Split-Hand Study to Evaluate the Effectiveness and Safety of Large-Gel-Particle Hyaluronic Acid with Lidocaine for the Correction of Volume Deficits in the Dorsal Hand. Plast Reconstr Surg. 2019;144(4):586e-596e. View source · DOI
  • Retrospective study, no control group: A 2024 uncontrolled retrospective study of 58 women reported one-point hand improvement in 94.8% after one calcium hydroxylapatite session, with three minor adverse events.Bartoletti E, Favaroni A, Cavalieri L Optimized Calcium Hydroxylapatite Formulation and Its Injection Technique for Hand Rejuvenation: A Retrospective Study. Dermatol Pract Concept. 2024;14(4):e2024283. View source · DOI

Calcium Hydroxylapatite

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  • Systematic review: A 2023 manufacturer-funded systematic review of 12 studies reported increased collagen and cell proliferation with calcium hydroxylapatite, but most studies had methodological limitations and only 7 had a control group.Amiri M, et al. Skin regeneration-related mechanisms of Calcium Hydroxylapatite (CaHA): a systematic review. Front Med (Lausanne). 2023;10:1195934. View source · DOI
  • Narrative review: A 2023 narrative review, with a manufacturer-employed co-author and no pooled sample, described immediate volume restoration and increases in collagen, elastin and fibroblasts with calcium hydroxylapatite acting as a scaffold.Aguilera SB, et al. The Role of Calcium Hydroxylapatite (Radiesse) as a Regenerative Aesthetic Treatment: A Narrative Review. Aesthet Surg J. 2023;43(10):1063-1090. View source · DOI · PMID 37635437
  • Consensus: A 2021 manufacturer-funded consensus of 12 Asian experts agreed cannulas should be used for calcium hydroxylapatite but disagreed on several points, citing diverse patient presentations.Corduff N, et al. Pan-Asian Consensus on Calcium Hydroxyapatite for Skin Biostimulation, Contouring, and Combination Treatments. J Clin Aesthet Dermatol. 2021;14(8):E76-E85. View source · PMID 34840663
  • Case series: A 2018 manufacturer-supported biopsy study of 5 women reported type III collagen fibres at 34.42% in treated skin versus 1.76% in control skin at 2 months (p<0.01).Zerbinati N, Calligaro A Calcium hydroxylapatite treatment of human skin: evidence of collagen turnover through picrosirius red staining and circularly polarized microscopy. Clin Cosmet Investig Dermatol. 2018;11:29-35. View source · DOI

Poly-L-Lactic Acid

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  • Systematic review of RCTs: A 2024 systematic review of 11 trials reported mild-to-moderate events including nodules; five trials had high risk of bias and authors rated the evidence low quality.Signori R, Barbosa AP, Cezar-dos-Santos F, Carbone AC, Ventura S, Nobre BBS, Neves MLBB, Câmara-Souza MB, Poluha RL, De la Torre Canales G Efficacy and Safety of Poly-l-Lactic Acid in Facial Aesthetics: A Systematic Review. Polymers (Basel). 2024;16(18):2564. View source · DOI · PMID 39339028
  • Multicentre double-blind RCT, China: A 2026 Chinese double-blind randomized trial of 252 adults reported 92.4% nasolabial fold correction with PLLA versus 59.3% with hyaluronic acid at 48 weeks; erythema occurred in 93.7% with PLLA versus 80.8% with HA.Wang Z, Ting W, Zhao H, Huang L, Ma J, Liu H, Liang Y, Shu M, Jin L, Yu N, Long X Long-Term Correction of Nasolabial Folds Using Poly-L-Lactic Acid Microspheres: A Multicenter, Double-Blinded, Randomized Trial. Aesthet Surg J Open Forum. 2026;8:ojag001. View source · DOI · PMID 41694326

Polycaprolactone

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  • Retrospective case series, Caucasian women: A 2022 retrospective case series of nine Caucasian women found that, two years after polycaprolactone filler in the cheeks, the measured volume was 50-150% greater than the volume of filler injected, with no adverse events; the sample was small.Angelo-Khattar M Objective Assessment of the Long-Term Volumizing Action of a Polycaprolactone-Based Filler. Clin Cosmet Investig Dermatol. 2022;15:2895-2901. View source · DOI
  • Systematic review and meta-analysis of RCTs: A 2024 Korean meta-analysis of nine trials, including 299 PCL participants, compared collagen-stimulating filler with hyaluronic acid; data were limited and heterogeneous.Efficacy and Safety of Nasolabial Fold Correction Using Collagen-Stimulating Filler: A Systematic Review and Meta-Analysis. Korean J Dermatol. 2024. View source

Polynucleotides

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  • Narrative review: A 2024 narrative review, which pooled no sample, reported some studies showing gains in skin elasticity and hydration, others limited or no benefit, and said more research is needed.Lee KWA, et al. Polynucleotides in Aesthetic Medicine: A Review of Current Practices and Perceived Effectiveness. Int J Mol Sci. 2024;25(15):8224. View source · DOI
  • Narrative review: A 2026 narrative review, which pooled no sample, described hyaluronic acid for structural under-eye correction and polynucleotides for dermal quality, with study heterogeneity limiting firm conclusions.Khan RS, Hafeez K Hyaluronic Acid Fillers Versus Polynucleotides for Under-Eye Rejuvenation. J Clin Med. 2026;15(13):4971. View source · DOI
  • Expert opinion: A 2026 manufacturer-funded expert panel paper proposed polynucleotide protocols for 4 indications and stated the evidence base remains limited, with randomised trials and histological validation still needed.Rho NK, et al. Expert Perspectives: Evidence-Based Applications of Polynucleotides (PNs) in Aesthetic Medicine and Dermatology. Clin Cosmet Investig Dermatol. 2026;19:1-9 (article 557226). View source · DOI

Hybrid Hyaluronic Acid

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  • Cohort: A 2016 uncontrolled, distributor-supported study of 64 women reported wrinkle severity down 14.7% at week 16, with minor temporary local skin reactions in 23%.Sparavigna A, Tenconi B Efficacy and tolerance of an injectable medical device containing stable hybrid cooperative complexes of high- and low-molecular-weight hyaluronic acid: a monocentric 16 weeks open-label evaluation. Clin Cosmet Investig Dermatol. 2016;9:297-305. View source · DOI
  • Cohort: A 2026 uncontrolled pilot of 10 adults reported peak pore refinement at day 120 in 9 of 10, with regression in most by day 180.Koppert E, et al. Hybrid cooperative complex treatment is associated with reduced facial pore size in a pilot study. Sci Rep. 2026;16:26913. View source · DOI
  • Narrative review: A 2024 narrative review, with medical writing supported by the manufacturer and 3 employee authors, summarised laboratory and clinical literature on thermally made hybrid hyaluronic acid complexes, without pooled figures.Humzah D, et al. Intradermal Injection of Hybrid Complexes of High- and Low-Molecular-Weight Hyaluronan: Where Do We Stand and Where Are We Headed in Regenerative Medicine?. Int J Mol Sci. 2024;25(6):3216. View source · DOI

Skin Boosters

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  • Systematic review: A 2023 systematic review, counting 13 studies in its abstract and 15 in its results, reported improved hydration and firmness with injectable hyaluronic acid and said large randomised trials are required.Ghatge AS, Ghatge SB The Effectiveness of Injectable Hyaluronic Acid in the Improvement of the Facial Skin Quality: A Systematic Review. Clin Cosmet Investig Dermatol. 2023;16:891-899. View source · DOI
  • RCT: A 2026 randomised assessor-blinded trial of 448 adults reported greater skin hydration with non-cross-linked hyaluronic acid than no treatment at all post-treatment points (P<0.001), with no serious adverse events.Cheng H, et al. A Prospective, Multicenter, Randomized, Assessor-Blinded Study Assessing the Efficacy and Safety of Injectable Non-Cross-Linked Hyaluronic Acid for Improving Facial Skin Rejuvenation. Clin Cosmet Investig Dermatol. 2026;19:1-10 (article 590699). View source · DOI
  • RCT: A 2023 double-blind split-face trial of 28 subjects, with manufacturer-affiliated authors, reported crow's feet wrinkle depth down 10% with gel versus up 7% with saline, 10 days after the last session.Duteil L, et al. The Effects of a Non-crossed-linked Hyaluronic Acid Gel on the Aging Signs of the Face versus Normal Saline: A Randomized, Double-blind, Placebo-controlled, Split-faced Study. J Clin Aesthet Dermatol. 2023;16(2):29-36. View source
  • RCT: A 2025 manufacturer-funded randomised split-face trial of 30 women reported lower photoaging scores with 48 mg than 24 mg of hyaluronic acid; injection-site bruising and redness occurred in 23.3%.Wang S, et al. Dose-Dependent Effects of Cross-Linked Hyaluronic Acid Through Intradermal Injection on Female Facial Photoaging: A Prospective Study. Aesthet Surg J Open Forum. 2025;7:ojaf046. View source · DOI · PMID 40599706

Thread Lifts

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  • RCT: A 2025 randomised trial of 22 patients found no significant difference between 6 and 3 threads per side for lifting or satisfaction; early gains faded by day 60 and 11 reported pain.Germani M, et al. Is More Always Better? A Randomized Comparative Clinical Trial About the Impact of Polydioxanone Threads Quantity for Facial Lifting. Aesthet Surg J Open Forum. 2025;7:ojaf002. View source · DOI · PMID 40236886

Hydradermabrasion

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  • Multicentre open-label prospective study, no control group: A 2022 open-label uncontrolled study of 20 acne patients reported the share rated clear or almost clear by investigators rising from 20 to 65 percent over six treatments; one author was a company employee.Storgard R, Mauricio-Lee J, Mauricio T, Zaiac M, Karnik J Efficacy and Tolerability of HydraFacial Clarifying Treatment Series in the Treatment of Active Acne Vulgaris. J Clin Aesthet Dermatol. 2022;15(12):42-46. View source · PMID 36569524

LDM Ultrasound

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  • Prospective single-arm pilot study, Asian patients: A 2021 Korean single-arm pilot of 26 Asian patients found erythema score fell from 2.53 to 1.61 after dual-frequency ultrasound; uncontrolled, small and manufacturer-sponsored, no serious effects.Kim YJ, Moon IJ, Lee HW, Won CH, Chang SE, Lee MW, Choi JH, Lee WJ The Efficacy and Safety of Dual-Frequency Ultrasound for Improving Skin Hydration and Erythema in Patients with Rosacea and Acne. J Clin Med. 2021;10(4):834. View source · DOI

Oral Collagen

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  • Systematic review and meta-analysis of RCTs: A 2023 meta-analysis of 26 trials and 1,721 participants found oral collagen improved hydration and elasticity over placebo; authors identified several biases and called for larger trials.Pu SY, Huang YL, Pu CM, Kang YN, Hoang KD, Chen KH, Chen C Effects of Oral Collagen for Skin Anti-Aging: A Systematic Review and Meta-Analysis. Nutrients. 2023;15(9):2080. View source · DOI · PMID 37432180
  • Meta-analysis of RCTs: A 2025 meta-analysis of 23 trials and 1,474 participants found oral collagen benefits overall, but high-quality and non-pharma-funded trials showed no significant effect.Myung SK, Park Y Effects of Collagen Supplements on Skin Aging: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Am J Med. 2025;138(9):1264-1277. View source · DOI · PMID 40324552

Exosomes

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  • Narrative review: A 2025 narrative review, with no pooled sample, reported preclinical promise for exosomes but lacking clinical studies and substantial concerns including infection, inflammatory response and promotion of malignancy.Mahmoud RH, et al. Exosomes: A Comprehensive Review for the Practicing Dermatologist. J Clin Aesthet Dermatol. 2025;18(4):33-40. View source
  • Scoping review: A 2026 scoping review screened 2,394 articles, found 18 on topical exosomes, called human studies scarce, and found products gave minimal information on isolation, processing or shelf life.Knauer G, et al. Clinical Evidence and Commercial Landscape of Topical Exosomes for Skin Rejuvenation: A Scoping Review. Aesthet Surg J. 2026;46(11):NP148-NP157. View source · DOI · PMID 42411735
  • Systematic review: A 2025 systematic review of 11 studies with 298 patients reported improvement in at least one hair measure and no serious adverse events, but only 2 were randomised and samples were small.Al Ameer MA, et al. Exosomes and Hair Regeneration: A Systematic Review of Clinical Evidence Across Alopecia Types and Exosome Sources. Clin Cosmet Investig Dermatol. 2025;18:2215-2227. View source · DOI
  • Narrative review: A 2026 narrative review, with no pooled figures, reported insufficient high-quality clinical trials and adverse reactions linked to unapproved exosome products, and called for validation, standardisation and stronger regulation.Contreras C, Ariza-Donado A Extracellular Vesicles in Regenerative and Cosmetic Medicine: Safety, Clinical Effectiveness, Therapeutic Applications, and Regulatory Challenges. Int J Mol Sci. 2026;27(12):5541. View source · DOI

Sun Protection

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  • Cohort: A 2016 uncontrolled 18-month study of 14 elderly Japanese people, with company-employed authors, found only hydration changed significantly; spot and tone changes correlated with sunscreen amount used.Mizuno M, et al. The effects of continuous application of sunscreen on photoaged skin in Japanese elderly people: the relationship with the usage. Clin Cosmet Investig Dermatol. 2016;9:95-105. View source · DOI
  • Narrative review: A 2023 narrative review, with manufacturer-employed authors and no pooled sample, said skin of colour is predisposed to pigmentary disorders and suggested broad-spectrum high-SPF sunscreen also covering UVA1 and visible light.Krutmann J, et al. Photoprotection for people with skin of colour: needs and strategies. Br J Dermatol. 2023;188(2):168-175. View source · DOI · PMID 36763874
  • Narrative review: A 2025 literature review, with no pooled sample, reported early broad-spectrum sunscreen enhanced recovery and reduced inflammation after light or laser treatment, and found a gap between patients' knowledge and adherence.Lee KWA, et al. Importance of Using Sunscreen After Light or Laser Facial Treatment: A Literature Review. Life (Basel). 2025;15(9):1484. View source · DOI

Male Hair Loss

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  • Systematic review: A 2022 network meta-analysis of 23 studies reported the greatest 24-week total hair count gain with dutasteride 0.5 mg daily and greatest 48-week terminal hair gain with finasteride 1 mg daily.Gupta AK, et al. Relative Efficacy of Minoxidil and the 5-α Reductase Inhibitors in Androgenetic Alopecia Treatment of Male Patients: A Network Meta-analysis. JAMA Dermatol. 2022;158(3):266-274. View source · DOI · PMID 35107565
  • Systematic review: A 2025 meta-analysis of 7 trials with 396 men found greater hair density with minoxidil-finasteride than minoxidil alone in a pooled subset of 5 trials (mean difference 9.22, p=0.04), with high heterogeneity and moderate-certainty evidence.Li Y, et al. Comparing minoxidil-finasteride mixed solution with minoxidil solution alone for male androgenetic alopecia: a systematic review and meta-analysis of randomized controlled trials. Front Med (Lausanne). 2025;12:1632139. View source · DOI
  • Systematic review: A 2025 meta-analysis of 4 trials with 257 patients found no significant hair density difference between oral and topical minoxidil (mean difference 0.95); hypertrichosis was more extensive with oral.Fazal F, et al. Can oral minoxidil be the game changer in androgenetic alopecia? A comprehensive review and meta-analysis comparing topical and oral minoxidil for treating androgenetic alopecia. Skin Health Dis. 2025;5(2):95-101. View source · DOI · PMID 40365252

Female Hair Loss

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  • Consensus: A 2019 expert committee report, with no patient sample, concluded treatment should start with 5% minoxidil, adding 5α-reductase inhibitors or antiandrogens for severe loss or hyperandrogenism.Carmina E, et al. Female Pattern Hair Loss and Androgen Excess: A Report From the Multidisciplinary Androgen Excess and PCOS Committee. J Clin Endocrinol Metab. 2019;104(7):2875-2891. View source · DOI · PMID 30785992
  • RCT: A 2022 randomised trial of 120 women reported 24-week hair density gains of 9.95/cm² with minoxidil, 16.76 adding spironolactone and 30.33 adding microneedling; the spironolactone group reported the most adverse effects.Liang X, et al. Efficacy and Safety of 5% Minoxidil Alone, Minoxidil Plus Oral Spironolactone, and Minoxidil Plus Microneedling on Female Pattern Hair Loss: A Prospective, Single-Center, Parallel-Group, Evaluator Blinded, Randomized Trial. Front Med (Lausanne). 2022;9:905140. View source · DOI
  • Systematic review: A 2021 systematic review of 42 studies, including 776 women, reported platelet-rich plasma showed efficacy for hair density, but said standardised protocols and large randomised trials are still required.Zhou S, et al. Platelet-Rich Plasma in Female Androgenic Alopecia: A Comprehensive Systematic Review and Meta-Analysis. Front Pharmacol. 2021;12:642980. View source · DOI

Laser Therapy for Hair

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  • Systematic review: A 2021 meta-analysis of 7 double-blinded trials with 607 participants reported greater hair density with home-use low-level light than sham (standardised mean difference 1.27); no trial exceeded 26 weeks.Lueangarun S, et al. A Systematic Review and Meta-analysis of Randomized Controlled Trials of United States Food and Drug Administration-Approved, Home-use, Low-Level Light/Laser Therapy Devices for Pattern Hair Loss: Device Design and Technology. J Clin Aesthet Dermatol. 2021;14(11):E64-E75. View source
  • Narrative review: A 2020 literature review of 10 randomised trials reported significant hair diameter or density increases in all sham-controlled studies, with minor adverse effects, cautioning that some studies had industry ties.Egger A, et al. Examining the Safety and Efficacy of Low-Level Laser Therapy for Male and Female Pattern Hair Loss: A Review of the Literature. Skin Appendage Disord. 2020;6(5):259-267. View source · DOI · PMID 33088809

PRP and Micrografts

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  • Systematic review: A 2024 meta-analysis of 5 randomised trials reported higher hair density at 5 to 6 months adding platelet-rich plasma to minoxidil (mean difference 17.80), on very low-certainty evidence.Yao J, et al. The additive value of platelet-rich plasma to topical Minoxidil in the treatment of androgenetic alopecia: A systematic review and meta-analysis. PLoS One. 2024;19(8):e0308986. View source · DOI
  • Systematic review: A 2025 systematic review of 6 trials with 322 patients, not pooled, reported more terminal hair gain with minoxidil and more density gain with platelet-rich plasma; pain was the commonest plasma effect.Abid A, et al. Comparison of the efficacy of platelet-rich plasma with topical minoxidil in treating patients with androgenetic alopecia: a systematic review of clinical trials. Skin Health Dis. 2025;5(5):311-318. View source · DOI · PMID 41035833
  • Narrative review: A 2025 manufacturer-linked narrative review reported short-term hair density and thickness gains with autologous micrografting, from mostly non-randomised, small studies with follow-up of about a year at most.Wang V, et al. A Decade of Autologous Micrografting Technology in Hair Restoration: A Review of Clinical Evidence and the Evolving Landscape of Regenerative Treatments. Cosmetics. 2025;12(6):254. View source · DOI

Radiofrequency for the Body

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  • Cohort: A 2024 manufacturer-supported single-arm study of 44 patients reported abdominal circumference down 1.9 cm and soft-tissue thickness down about 3.1 to 3.5 mm at 3 months after radiofrequency with muscle stimulation.Vranis NM, et al. Radiofrequency and Electrical Muscle Stimulation: A Synergistic Treatment That Achieves Lipolysis and Circumferential Waist Reduction in Noninvasive Body Contouring. Aesthet Surg J Open Forum. 2024;6:ojae042. View source · DOI · PMID 39165914
  • RCT: A 2022 randomised study of 60 women reported waist reduction after radiofrequency and combined treatment but not ultrasound; only radiofrequency lasted at 6 months, with no change in lipid or insulin markers.Kiedrowicz M, et al. Early and Long-Term Effects of Abdominal Fat Reduction Using Ultrasound and Radiofrequency Treatments. Nutrients. 2022;14(17):3498. View source · DOI

HIFEM

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  • Literature review: A 2022 review of 17 HIFEM papers reported 14.3-19% abdominal fat reduction and 10.8-20.5% muscle thickness gain at one month; weight did not change, and soreness was reported.Leonik S, Smoczok M, Sazanów-Lubelski J, Bergler-Czop B High-intensity focused electromagnetic field – application in aesthetic medicine. Dermatol Rev. 2022;109(3):229-235. View source · DOI
  • Single-group CT study, no control arm: A 2019 uncontrolled CT study of 22 subjects measured 17.5% less abdominal fat and 14.8% thicker rectus muscle one month after eight HIFEM treatments; no adverse events were reported.Kent DE, Jacob CI Simultaneous Changes in Abdominal Adipose and Muscle Tissues Following Treatments by High-Intensity Focused Electromagnetic (HIFEM) Technology-Based Device: Computed Tomography Evaluation. J Drugs Dermatol. 2019;18(11):1098-1102. View source

Cryolipolysis

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  • Systematic review: A 2025 meta-analysis of 28 studies with 13,078 patients estimated paradoxical adipose hyperplasia at 0.22% (about 1 in 455), low-certainty evidence that appears higher than manufacturer reports.Mah AE, et al. Incidence of Paradoxical Adipose Hyperplasia After Cryolipolysis: A Systematic Review and Meta-Analysis. Aesthet Surg J Open Forum. 2025;7:ojaf142. View source · DOI · PMID 41322038
  • Narrative review: A 2014 narrative review reported up to 25% fat reduction after one treatment, and 33 paradoxical hyperplasia cases were noted.Krueger N, et al. Cryolipolysis for noninvasive body contouring: clinical efficacy and patient satisfaction. Clin Cosmet Investig Dermatol. 2014;7:201-205. View source · DOI
  • Cohort: A 2023 manufacturer-funded nonrandomised study of 48 Chinese-descent adults reported caliper fat thickness down 6.5 mm in arms and 6.6 mm in inner thighs at 12 weeks.Rivers JK, et al. Cryolipolysis of the Arms and Inner Thighs Shows Similar Treatment Outcomes in Chinese Individuals Compared to White Individuals Treated in a Prior Study: The XinCOOL Study. Aesthet Surg J Open Forum. 2023;5:ojad103. View source · DOI · PMID 38108021
  • Cohort: A 2021 review of 2,114 patients at 8 centres reported paradoxical adipose hyperplasia in 0.15% of cycles, above the manufacturer's 0.025%, falling over 75% with newer units.Nikolis A, Enright KM A Multicenter Evaluation of Paradoxical Adipose Hyperplasia Following Cryolipolysis for Fat Reduction and Body Contouring: A Review of 8658 Cycles in 2114 Patients. Aesthet Surg J. 2021;41(8):932-941. View source · DOI · PMID 33216910

Deoxycholic Acid

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  • Systematic review and meta-analysis of RCTs: A 2023 meta-analysis of five trials and 1,837 patients found deoxycholic acid at the higher dose raised the chance of a one-point submental improvement about 2.3-fold (RR 2.28; RR 5.30 for a two-point improvement) and of numbness about 13-fold (RR 13.09); all trials showed potential industry bias.Inocêncio GSG, Meneses-Santos D, Costa MDMA, Vieira WA, de Almeida VL, Rodrigues RP, Rode SM, Paranhos LR Efficacy, safety, and potential industry bias in using deoxycholic acid for submental fat reduction: A systematic review and meta-analysis of randomized clinical trials. Clinics (Sao Paulo). 2023;78:100220. View source · DOI
  • Systematic review with management recommendations: A 2024 systematic review of 26 reports cited nerve paresis in 4% of deoxycholic acid trial patients (20/513) versus under 1% on placebo, with these trial rates taken from the product label.Shridharani SM, Kennedy ML Management of Serious Adverse Events Following Deoxycholic Acid Injection for Submental and Jowl Fat Reduction: A Systematic Review and Management Recommendations. Aesthet Surg J Open Forum. 2024;6:ojae061. View source · DOI

Buttock Augmentation

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  • Systematic literature review: A 2023 literature review found only 12 mostly biased reports on injectable buttock augmentation, a low level of evidence, and noted that serious complications may occur.Atiyeh BS, Ghieh FM, Oneisi AK Safety and Efficiency of Minimally Invasive Buttock Augmentation: A Review. Aesthetic Plast Surg. 2023. View source · DOI · PMID 35999464
  • Prospective multicentre open-label single-cohort trial: A 2022 open-label trial of 30 women reported 84% physician-rated improvement after buttock PLLA; pain during treatment averaged 70.97% and bruising 28.80%; there was no control group.Nikolis A, Enright KM, Avelar LE, Rice S, Sinno H, Rizis D, Cotofana S A Prospective, Multicenter Trial on the Efficacy and Safety of Poly-L-Lactic Acid for the Treatment of Contour Deformities of the Buttock Regions. J Drugs Dermatol. 2022;21(3):295-303. View source · DOI

Vaginal Laser

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  • RCT: A 2021 sham-controlled randomised trial of 85 women reported fractional CO2 laser did not significantly improve vaginal symptoms after 12 months; spotting occurred in 30% versus 5% with sham.Li FG, et al. Effect of Fractional Carbon Dioxide Laser vs Sham Treatment on Symptom Severity in Women With Postmenopausal Vaginal Symptoms: A Randomized Clinical Trial. JAMA. 2021;326(14):1381-1389. View source · DOI · PMID 34636862
  • Systematic review: A 2022 meta-analysis of 6 randomised trials with 270 women (4 pooled) found no significant differences between CO2 laser and vaginal estrogen on main measures; non-inferiority was not formally tested.Jang YC, et al. Comparison of Severity of Genitourinary Syndrome of Menopause Symptoms After Carbon Dioxide Laser vs Vaginal Estrogen Therapy: A Systematic Review and Meta-analysis. JAMA Netw Open. 2022;5(9):e2232563. View source · DOI · PMID 36129710

Vaginal Radiofrequency

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  • RCT: A 2018 manufacturer-funded post hoc analysis of a sham-controlled trial in 108 premenopausal women reported greater 6-month arousal, lubrication and orgasm score improvement with active radiofrequency than sham.Krychman M, et al. Effect of Single-Session, Cryogen-Cooled Monopolar Radiofrequency Therapy on Sexual Function in Women with Vaginal Laxity: The VIVEVE I Trial. J Womens Health (Larchmt). 2018;27(3):297-304. View source · DOI · PMID 29182498
  • RCT: A 2024 sham-controlled randomised trial of 76 women reported greater vaginal laxity improvement at 4, 6 and 12 months, but sexual function improvement not significantly better than sham at all visits.Nappi RE, et al. Efficacy and safety of a device that combines multipolar radiofrequency with pulsed electromagnetic field for the treatment of vulvovaginal atrophy: a randomized, sham-controlled trial. J Sex Med. 2024;21(3):203-210. View source · DOI · PMID 38286753

Regulatory Positions on Vaginal Devices

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  • Guidance: A 2018 FDA statement said it had not evaluated these devices for vaginal rejuvenation, reported numerous cases of burns, scarring, painful intercourse and chronic pain, and notified 7 manufacturers.US Food and Drug Administration Statement from FDA Commissioner Scott Gottlieb, M.D., on efforts to safeguard women's health from deceptive health claims and significant risks related to devices marketed for use in medical procedures for "vaginal rejuvenation". FDA statement. 2018. View source
  • Guidance: A 2018 ISSVD and ICS position statement recommended against laser and radiofrequency for vulvovaginal atrophy, lichen sclerosus, vulvodynia, incontinence or rejuvenation outside properly designed clinical trials.International Society for the Study of Vulvovaginal Disease, International Continence Society ISSVD/ICS comments on the FDA communication on the use of energy-based devices to perform vaginal 'rejuvenation' or vaginal cosmetic procedures. ISSVD/ICS position statement. 2018. View source
  • Guidance: A 2021 ACOG clinical consensus stated laser therapy is neither FDA-approved nor FDA-cleared for menopause symptoms, cited largely small observational studies, and said more research is warranted before recommending it.American College of Obstetricians and Gynecologists Treatment of Urogenital Symptoms in Individuals With a History of Estrogen-dependent Breast Cancer: Clinical Consensus. ACOG Clinical Consensus No. 2. 2021. View source

Vaginal Atrophy

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  • Professional position statement: A 2020 North American Menopause Society position statement said genitourinary syndrome affects 27% to 84% of postmenopausal women, and that placebo-controlled energy-device trials were insufficient to conclude.The NAMS 2020 GSM Position Statement Editorial Panel The 2020 genitourinary syndrome of menopause position statement of The North American Menopause Society. Menopause. 2020;27(9):976-992. View source · DOI · PMID 32852449
  • Cochrane systematic review: A 2016 Cochrane review of 30 trials and 6,235 women found that in two small trials (198 women) vaginal oestrogen cream improved symptoms over placebo (OR 4.10), but the evidence was low quality and adverse events were not compared with placebo.Lethaby A, et al. Local oestrogen for vaginal atrophy in postmenopausal women. Cochrane Database Syst Rev. 2016;CD001500. View source · DOI · PMID 27577677

Pelvic Floor Training

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  • Cochrane systematic review: A 2020 Cochrane review of 46 trials and 10,832 women found antenatal training cut late-pregnancy urinary incontinence 62% in continent women; many trials carried moderate-to-high bias risk.Woodley SJ, Lawrenson P, Boyle R, Cody JD, Mørkved S, Kernohan A, Hay-Smith EJC Pelvic floor muscle training for preventing and treating urinary and faecal incontinence in antenatal and postnatal women. Cochrane Database Syst Rev. 2020;5:CD007471. View source · DOI · PMID 32378735
  • Systematic review: A 2025 systematic review of five trials and 444 first-time mothers found urinary symptoms improved with postpartum training, though results were very heterogeneous and two studies showed no difference.Ibáñez-Vera AJ, Cano-Castilla M, Carazo-Carrascosa V, Díaz-Mohedo E Effectiveness of Pelvic Floor Muscle Strength Training to Prevent and Treat Urinary Incontinence in Postpartum Primiparous Women: A Systematic Review. J Obstet Gynaecol Can. 2025;47(9):103023. View source · DOI

Brain Stimulation

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  • Meta-analysis of randomized sham-controlled trials: A 2021 meta-analysis of 27 rTMS sham-controlled insomnia trials found sleep quality scores improved by 4.08 PSQI points; 16 electrical-stimulation trials showed no objective sleep benefit.Ma H, Lin J, He J, Lo DHT, Tsang HWH Effectiveness of TES and rTMS for the Treatment of Insomnia: Meta-Analysis and Meta-Regression of Randomized Sham-Controlled Trials. Front Psychiatry. 2021;12:744475. View source · DOI
  • European expert guideline update: A 2020 European rTMS guideline update gave Level A evidence for depression, neuropathic pain and post-stroke hand recovery; its abstract named no sleep, burnout or general stress indication.Lefaucheur JP, Aleman A, Baeken C, et al. Evidence-based guidelines on the therapeutic use of repetitive transcranial magnetic stimulation (rTMS): An update (2014-2018). Clin Neurophysiol. 2020;131(2):474-528. View source

General information only. Last updated 6 November 2026.