Excimer laser for vitiligo
Same idea as phototherapy, delivered differently: a 308 nm beam aimed only at the patch. That precision buys higher doses and faster results on small areas — and makes it the wrong tool for widespread disease.
At a glance
- What it is
- 308 nm targeted ultraviolet light
- Best for
- A few small patches, especially facial
- Frequency
- 2 sessions a week
- Typical course
- 24–48 sessions
- First signs
- Often by 8–12 sessions on the face
- Not for
- Widespread or unstable disease
Precision, and what precision buys.
Narrowband UVB treats the whole body, which means the dose is limited by what your normal skin can tolerate. Excimer treats only the patch, so the dose can be pushed considerably higher without burning the skin around it.
Two practical consequences follow. Results generally come faster — facial patches often show the first pigment within eight to twelve sessions rather than three months. And the normal skin is not tanned, so the contrast problem that makes early phototherapy look discouraging largely disappears.
The trade is coverage. Treating a large surface patch by patch is slow and expensive, which is why excimer is chosen for a handful of stubborn areas and narrowband UVB for anything widespread. Many patients have both — full-body light for the general disease, excimer for the two patches that won’t shift.
Excimer or NB-UVB?
| Excimer laser | Narrowband UVB | |
|---|---|---|
| Area treated | Individual patches only | Whole body or large regions |
| Dose per session | Higher — normal skin spared | Limited by normal skin |
| First visible change | Often 8–12 sessions | Usually 2–3 months |
| Normal skin tanning | Minimal | Expected |
| Best for | Few, small, localised patches | Widespread disease |
| Cost per session | Higher | Lower |
| Cost per course | Depends on area treated | Predictable |
These are not competitors. On a patient with scattered disease plus two stubborn facial patches, using both is the correct answer.
What treatment involves
A test dose
The first session establishes how your skin responds. Everything after is titrated against that.
Twice a week
Sessions are short — the beam is applied patch by patch, often only seconds each. Most appointments take minutes.
Reviewed at 12 sessions
Facial patches showing perifollicular dots by then are on track. No change at all after 20 sessions is a reason to reconsider.
Stop or hand over
Once the patch has recoloured, treatment stops. Patches that do not respond are assessed for grafting instead.
Where excimer will not help.
Excimer is light, and light works by recruiting pigment cells from hair follicles. Where that reservoir is gone, more light — however precisely aimed — does not create it.
Patches with white hairs, lips, and fingertips remain poor responders with excimer just as they are with narrowband UVB. Being told that at the start saves twenty sessions of finding out.
What works on those sitesWhite hairs in the patch
The follicular reservoir is depleted. Surgery is the option that brings pigment cells from elsewhere.
Active disease
Spreading vitiligo is quietened first. Repigmenting one patch while three more appear is not progress.
Excimer laser questions
How many excimer sessions are needed?
Typically 24 to 48, at two sessions a week. Facial patches often need fewer; patches on the limbs need more, and some need to be reassessed for surgery instead.
Is excimer better than phototherapy?
Not better — different. Excimer is faster and more precise for a few small patches. Narrowband UVB is the right choice for widespread disease. For many patients the correct plan uses both.
Does excimer laser hurt?
Very little. Most patients describe warmth. Mild pinkness for a day afterwards is the intended response; blistering means the dose was too high and is adjusted.
Can excimer treat lips or fingertips?
It can be aimed there, but response is poor because those sites have little or no follicular pigment reserve. Grafting is usually the more realistic option.
Is it safe for children?
Yes, and its precision is an advantage in children because total-body ultraviolet exposure is avoided. Cooperation with goggles is the practical limiting factor.
Related on this site
The first appointment is a diagnosis.
Not a treatment plan sold on the spot. Message the clinic and bring your history.