If you’ve been researching light-based treatments for vitiligo, you’ve probably run into two different things that sound similar: red light therapy, and medical UVB or excimer laser treatment. They are not the same thing, and it matters which one you’re actually asking about. This page covers narrowband UVB and excimer laser — the light-based treatments dermatologists actually prescribe for vitiligo repigmentation.
How UVB and Excimer Laser Treatment Works
Narrowband UVB (ultraviolet B) and excimer laser both work on the same basic idea: a specific, controlled wavelength of ultraviolet light is used to stimulate the melanocytes remaining at the edges of a depigmented patch, encouraging them to migrate into the patch and produce pigment again. It’s a real medical treatment, prescribed and monitored by a dermatologist, not something to try to replicate with a home tanning bed or unshielded sun exposure.
Narrowband UVB
Narrowband UVB uses a specific band of UV light and can treat larger areas of the body at once, including full-body units for widespread vitiligo. It’s typically done two to three times a week at a dermatologist’s office or clinic, though some patients are prescribed a home unit for use under medical guidance.
Excimer Laser
Excimer laser delivers a similar wavelength of UV light but in a more targeted, higher-intensity beam, which makes it better suited to smaller, more localized patches rather than widespread vitiligo. Treatment sessions are usually shorter and often show results faster than narrowband UVB for small patches, though it isn’t practical for treating large areas of the body.
What Treatment Looks Like
Both treatments are done in a series of sessions, typically two to three times a week, and results build gradually over time rather than appearing after one visit. A dermatologist will track your progress and adjust the dose as your skin responds.
Results and a Realistic Timeline
This is the part that’s easy to underestimate: repigmentation from UVB or excimer laser typically takes months of consistent treatment, often six months to a year or longer, and results vary significantly by patient, by body location, and by how long a patch has been depigmented. Facial patches and areas with more hair follicles (which hold onto reserve melanocytes) tend to respond better than areas like hands and feet. Not everyone repigments fully, and some patients see partial results. A dermatologist experienced in vitiligo can give you a realistic sense of what to expect for your specific patches before you commit to a treatment course.
Possible Side Effects
Both treatments can cause temporary redness or a mild sunburn-like reaction at the treatment site. Longer-term UV exposure carries the same general skin-aging and skin-cancer considerations as any UV treatment, which is part of why it’s done under a dermatologist’s supervision rather than at home without guidance.
How This Is Different from Red Light Therapy
Red light therapy uses a different part of the light spectrum (visible red/near-infrared light, not ultraviolet) and works through a different mechanism, generally with a gentler safety profile and less robust evidence specifically for vitiligo repigmentation compared to medical UVB and excimer laser. If you’re weighing the two, see our page on red light therapy for vitiligo for how it compares.
While You’re Treating, You Don’t Have to Wait
A UVB or excimer laser treatment course is measured in months, and results aren’t guaranteed to be complete. In the meantime, my plant-based Vitiligo Cover Lotion blends with your natural skin tone to even out visible patches the same day, so you’re not putting your life on hold for the months it takes to see whether treatment is working. It’s also completely compatible with treatment — used cosmetically on patches you’re not actively treating, or on treated patches on days you’re not going in for a session.
Frequently Asked Questions
Is UV light actually good for vitiligo, or does it make it worse?
Under medical supervision, controlled narrowband UVB and excimer laser are established treatments that can help repigment vitiligo patches. That’s different from unprotected sun exposure or tanning beds, which aren’t a substitute and can damage skin. Always work with a dermatologist rather than trying to DIY this one.
Is laser treatment safe for vitiligo?
Excimer laser is a standard, dermatologist-administered treatment with a well-established safety profile when properly monitored. As with any UV-based treatment, it comes with the usual UV exposure considerations, which your dermatologist will factor into your treatment plan.
Does laser treatment actually work for vitiligo?
Many patients see meaningful repigmentation, especially on the face and areas with more hair follicles, though results vary and full repigmentation isn’t guaranteed for everyone. It typically takes months of consistent treatment to see results.
How much does UVB or excimer laser treatment cost?
Cost varies widely by provider, region, and whether insurance covers it (coverage for vitiligo treatment varies by plan). Ask your dermatologist’s office for a specific estimate and about insurance coverage before starting.
Ready When You Are
Whether you’re just starting to research treatment or you’re months into a UVB or excimer laser course, my plant-based Vitiligo Cover Lotion is here for the in-between. See the lotion and shop sizes here.