What white spots are
White spots are areas of skin with reduced or absent pigment, known as hypopigmentation. They appear when melanocytes, the cells that make pigment, are damaged, absent or under-stimulated in one area. A white spot is missing pigment. It is not a scar.
The key question is whether the cells are suppressed or lost. Suppressed cells can recover. Where they are lost, laser cannot help. A frosted look straight after a pigment laser pulse is a brief surface reaction. Pale patches that appear after healing are different, and they should be examined.
Common causes of white spots
| Cause | What it is | What usually follows |
|---|---|---|
| Post-inflammatory or laser-related | Follows acne, eczema, psoriasis or a procedure | Suppressed cells may recover, and FSX laser may be considered |
| Idiopathic guttate hypomelanosis | Small flat spots on sun-exposed skin, linked to UV and ageing | Does not repigment by itself |
| Pityriasis versicolor | Yeast overgrowth, usually on the trunk | Antifungal treatment, not laser |
| Vitiligo | Autoimmune loss of melanocytes, in clear patches that can spread | Specialist care with a dermatologist |
| Chemical or procedure-induced | Peels, cryotherapy, lasers or frequent toning | Slow response |
| Naevus depigmentosus | Patches present from birth, with cells present but not working normally | Assessed individually |
How white spots laser treatment is planned
Who it may suit and who should wait
Post-inflammatory patches with suppressed cells, confirmed guttate spots, and patches with pigment cells remaining at the border or in follicles. You should be happy to use daily sun protection and accept partial, gradual change.
Active fungal infection, active inflammation or infection, or an expectation of a complete colour match.
Recent tanning, recent isotretinoin, photosensitising medicines, a keloid tendency, pregnancy or breastfeeding, and any atypical lesion that needs a diagnosis first.
Spreading or suspected vitiligo goes to dermatology. Changing or atypical patches may need a biopsy.
What laser cannot do
Laser cannot restore pigment to every white spot. It can only encourage cells that remain. It cannot help long-standing patches where cells are lost, and it does nothing for pityriasis versicolor. New guttate spots can still appear with age and sun exposure. Evidence is limited. Some spots may not respond at all. Treated skin needs daily SPF 50 and protective clothing. Response is judged over months.
Risks and aftercare
Temporary redness, warmth and mild swelling are expected. Less often, post-inflammatory darkening can occur, especially in deeper skin tones, or pigment loss can paradoxically worsen. Blistering, infection and scarring are uncommon. For the first day, keep spots clean, avoid picking and avoid saunas. Use a gentle cleanser and moisturiser, and hold exfoliating acids and scrubs until reviewed. Contact the clinic the same day for blistering, crusting or weeping, increasing pain, spreading redness, new darkening, new white patches, or a spot that changes, bleeds or ulcerates. If pale spots appear during a laser course, pause laser on that area and have them examined. Results vary. Read more on laser toning.