How does HIFU work?
High-intensity focused ultrasound (HIFU) converges ultrasound energy at a chosen depth. Heat at each focal point prompts tissue contraction and a slow collagen response, while the skin surface is spared.
HIFU tends to suit early to moderate laxity in a face that has kept its volume. It does not replace lost volume, and it cannot remove heavy skin excess. Change is gradual, and it varies with age, skin quality, the degree of laxity, weight change, sun exposure and smoking.
Is cosmetic HIFU the same as hospital HIFU?
No. The physics is shared, but the job is not. In hospitals, high-intensity focused ultrasound is used at higher energy to destroy targeted tissue, for conditions such as prostate cancer and uterine fibroids. Cosmetic HIFU uses lower energy to heat small points in the skin and the SMAS for laxity. This page is about the cosmetic use on the face and neck.
Which layer does each HIFU depth reach?
Used along the jawline, under the chin and on the neck, where there is enough tissue above bone.
Used in the deeper skin layer, usually in the same plan as the 4.5 mm cartridge.
Used mainly for the upper face, where the skin sits close to bone.
Used in the upper skin layer.
Depth is not set from a preset. Dr Sin Yong feels the tissue thickness zone by zone, then chooses the cartridge, spacing and energy for each area.
Who is HIFU suitable for?
HIFU is aimed at early to moderate looseness along the jaw, under the chin and on the neck, where the face still has its volume. Age does not decide it. Use the table to sort what you see; the examination decides.
| What you notice | What it usually means | Is HIFU the main step? |
|---|---|---|
| Jawline softens when you tuck your chin, and the skin still springs back | Laxity in the skin and SMAS | Often, where the tissue over bone allows |
| Hollow at the temple or below the cheekbone | Volume loss | No; heat adds no volume |
| Fullness under the chin in every head position | Fat | Not as the main step |
| Lean face, little tissue over bone | Thin tissue that heat can hollow | Not planned; the VF Lift is usually considered |
| Skin in folds, or heavy jowls | Skin excess | No; a surgical opinion |
| Fine lines, pigment or redness | A surface problem | No; another treatment fits |
Which areas can HIFU treat?
Early laxity can respond. A full, fatty jowl needs a different plan, because contraction alone does not reduce it.
HIFU can help loose skin under the chin. A full double chin from fat is usually better treated another way.
Early neck laxity can be treated with the jawline. Deep bands and heavy skin need another assessment.
HIFU can address brow-related heaviness in the upper face. It does not treat the eyelid itself.
How do the Ultraformer MPT, Ultherapy Prime and New Doublo 2.0 differ?
A CLASSYS micro-pulsed HIFU platform without imaging. Face cartridges are 1.5, 2.0, 3.0 and 4.5 mm, and body cartridges are 6, 9 and 13 mm.
Micro-focused ultrasound with DeepSEE imaging of the tissue before each line, using 1.5, 3.0 and 4.5 mm cartridges.
A HIRONIC platform that pairs focused ultrasound for the SMAS and deep dermis with radiofrequency for the mid-layer and surface.
Labels such as "4D", "7D" and "12D" are maker names. They are not recognised depths or generations, so it is better to ask which device, which cartridges and how many lines are planned. See our Ultherapy page for more on imaging.
Which is better, HIFU or Ultherapy?
Neither is ranked first, because Ultherapy is itself one HIFU system, so the choice is a platform. Ultherapy Prime images the layers before every line, useful where depth is hard to judge, as over a thin temple or a previously treated face. The Ultraformer MPT uses fixed cartridge depths and micro-pulsed lines, and may suit uncomplicated laxity along the jaw and neck. Dr Sin Yong chooses the platform after examining you, and does not use HIFU on a lean face. See Ultherapy Singapore and Ultherapy vs HIFU.
A device is a tool
HIFU is a device, and how it is planned matters too. A study of focused ultrasound found that lift varied with line direction, line number, depth and energy on the same device. [4] Dr Sin Yong starts with your face, and he does not plan focused ultrasound for lean faces. See device or technique.
Why does a HIFU shot count tell you so little?
A shot count is the number of focal points delivered, and it leaves out most of what defines a treatment. Machines also count differently: the Ultraformer MPT lays energy in rapid micro-pulses along each line. In a study of 20 Korean patients treated once on the Ulthera system with 400 to 500 shots set by face size, blinded clinicians' ratings and patient satisfaction appeared similar across that range. It had no control group and did not test shot count directly. [5] Here, the line count is an output of the map.
| What a count leaves out | Why it matters |
|---|---|
| Depth | A point at 1.5 mm and one at 4.5 mm heat different layers |
| Energy per point or line | The same count at another energy is a different dose |
| Delivery | Shots, lines and micro-pulses are not the same unit |
| Where the lines go | Narrow and broad faces need different maps, and some zones get none |
How can you check which HIFU device you are getting?
Ask for the device's name; 4D or 7D is a label, not a device. In Singapore, medical devices must be registered with the Health Sciences Authority before supply, with some exceptions such as low-risk Class A devices, and its Singapore Medical Device Register can be searched. The National Environment Agency also controls HIFU apparatus under the Radiation Protection Act 2007, through licences that include one to keep it for use. Clinics and salons both use the name HIFU, so the same questions apply anywhere.
Here, Dr Sin Yong does both and follows up any side effect; the urgent signs listed on this page go to 995 or A&E.
Your written plan names it.
It is set zone by zone from your tissue, and some zones get no deep lines.
The lines follow the map, so the count is not fixed beforehand.
A fair question to put to any provider before booking.
How does Dr Sin Yong plan HIFU?
For Dr Sin Yong, HIFU is one option and not the default. He examines you himself before anything is planned.
He watches your face at rest and moving, and charts where the SMAS has loosened and where volume has been lost. That chart decides whether HIFU fits and which cartridge suits each zone.
He feels tissue thickness in each zone rather than using a fixed setting. The 4.5 mm cartridge is kept to zones with enough depth over bone, and lines avoid the thyroid, the eye socket rim and the path of the marginal mandibular nerve along the jaw.
A double chin can come from fat, the submandibular gland, a short chin or posture. He tells these apart by pinching, tilting the head and observing, before planning any line.
HIFU is not advised when looseness is not the main issue, or for a lean face, where the VF Lift is his first choice. Skin excess beyond what heat can contract goes to a plastic surgery specialist. There are no trial sessions or trial shots.
Your written plan says which mechanism was chosen and why. The review reads your response; it is not a booked repeat.
“The right question is what's actually loose on your face. The device follows from that, never the other way around.”
What HIFU Cannot Do
HIFU does not restore lost volume or treat hollowing, and it does not reduce a full fat pad. It does not treat fine lines, crepey skin, pigment, redness or movement lines. Heavy skin excess and deep jowls are beyond what contraction can reach, so these are referred to a plastic surgery specialist.
What are the disadvantages of HIFU?
These are the trade-offs to weigh before booking.
| Disadvantage | Who it affects most | What it means for the plan |
|---|---|---|
| Discomfort over bone | Treatment along the jaw, cheekbone or brow | Energy is adjusted to what you report |
| Tender, slightly swollen days | Anyone who bruises easily or has an event soon | Timing is planned around them |
| Slow, variable change | Older, sun-damaged or smokers' skin | Nothing is judged on the day, and no repeat is sold ahead |
| No help for volume loss, fat or heavy skin | Hollow, full or heavy faces | Another mechanism, or a surgical opinion |
| Fat loss over thin tissue | Lean faces | HIFU not planned for a lean face |
| Depends on the operator | Everyone | Ask who examines you and who sets depth and energy |
HIFU, a Facelift or Another Option
A surgical facelift can reposition tissue and remove excess skin, which HIFU cannot do. HIFU has no incisions, but its change is smaller and more gradual. If your face is lean, HIFU is not planned, because it can cause fat loss that looks like hollowing. The VF Lift, which uses Volnewmer monopolar radiofrequency, may be discussed instead.
What are the side effects of HIFU?
Redness, warmth, tenderness along the lines, mild swelling and small bruises.
A raised line or welt, temporary numbness or tingling, and prolonged tenderness over bone.
A surface burn, temporary weakness of facial movement if a nerve branch is affected, and fat loss that looks like hollowing in lean faces.
Contact us promptly about persistent numbness, blistering, marked swelling or any change in facial movement.
Can HIFU injure the eyes, and which signs are urgent?
It has been reported. In a 2023 case letter, a woman developed acute angle-closure glaucoma and a cataract after microfocused ultrasound around the eyes and face, alongside carboxytherapy to the eyelids. The device was not named, and a single case cannot give a rate. [6] Here, no lines go past the bony rim of the eye socket.
Change in vision or eye pain after filler or near the eye: call 995.
Trouble breathing or swallowing, or swelling of the tongue or throat: call 995.
Fever, spreading redness, pus, or a red hot lump: a doctor the same day, or A&E if none can see you.
In Asian skin, a surface burn is more likely to leave post-inflammatory darkening, and it can scar. Complication care sorts other signs by urgency, and HIFU side effects covers the rest.
Who Should Wait or Avoid It
Please wait if you are pregnant, or if you have an active infection, open wounds or inflamed acne in the area, a recent tan, or recent filler or threads in the treatment plane. Implants or metal in the field, a history of keloids and blood-thinning medicines are assessed individually.
What should you do before HIFU?
Tell the clinic about any filler, threads or implants in the face or neck, with dates if you know them. Mention pregnancy or breastfeeding, metal near the area, a keloid tendency, skin conditions and all medicines, including blood thinners. Avoid strong sun and tanning beforehand, because a recent tan is a reason to wait. If an event is coming up, say so, since tenderness and swelling come before any change. What follows the visit is on HIFU downtime and HIFU aftercare.
What to Expect
How long does HIFU last, and how are sessions spaced?
No length of time can be promised. The change comes from your own collagen, and your face keeps ageing around it. Age, skin quality, how loose the tissue was to begin with, weight change, sun and smoking all shape how long it is noticed. Results vary.
Visit length depends on the zones and depths planned, and you are told at consultation. There is no set course. Any repeat is decided at review, and sessions are not squeezed closer, since added heat over thin tissue brings risk without benefit. See how many HIFU sessions.
How much does HIFU cost in Singapore?
The fee depends on the zones treated, the cartridge depths and number of lines, the device and consumables, any combination with radiofrequency or laser, and the review visit. We do not publish prices. You receive a written quote after your examination. Treatments are not sold in advance.
Is HIFU worth the cost?
Fees are given only after examination, because they come from your plan: the zones, the depths each zone allows and the lines needed. Whether the fee is worth it depends on fit. What sets the HIFU fee lists each factor.
Looseness along the jaw, under the chin or on the neck is early to moderate, there is tissue to work with above bone, and you accept slow change with no set duration.
The sag comes from lost volume, a fat pad or heavy skin. Heating the wrong layer helps no one, and Dr Sin Yong will say so.
A 2023 systematic review of 16 studies, mostly in women, reported investigator-rated improvement at day 90. [1] A group finding cannot predict your own response.
HIFU, Ultherapy, Thermage and VF Lift Compared
| Option | Energy | Depth or method | Imaging |
|---|---|---|---|
| Ultraformer MPT | Focused ultrasound | 1.5, 2.0, 3.0 and 4.5 mm on the face | No |
| Ultherapy Prime | Micro-focused ultrasound | 1.5, 3.0 and 4.5 mm | Yes, before each line |
| Thermage FLX | Monopolar radiofrequency | Bulk heating of deeper skin | No |
| VF Lift | Monopolar radiofrequency on Volnewmer | Planned vertical zones | No |
| Time Freeze Laser LCLR® | Long-pulsed 755 nm and 1064 nm laser | Scanned across the dermis and superficial fat | No |
If your face is lean, Dr Sin Yong does not use HIFU or Ultherapy, and the VF Lift may be discussed instead. Read more about Ultherapy vs HIFU in Singapore.