Vitiligo is a chronic skin condition in which patches of skin lose their color, turning white or very light compared to the surrounding area. It affects roughly 0.2% to 1.8% of the global population, depending on how it’s measured, and it can appear at any age, on any skin tone. The color loss happens because the cells responsible for producing pigment, called melanocytes, are destroyed by the body’s own immune system.
Why Vitiligo Develops
Vitiligo is classified as an autoimmune condition. The immune system, which normally targets bacteria and viruses, mistakenly attacks and destroys the pigment-producing cells in the skin. Without these cells, the affected area can no longer produce melanin, the substance that gives skin its color. This is why the patches appear strikingly white rather than just slightly lighter.
Genetics play a significant role. Variations in over 30 genes have been linked to an increased risk of developing vitiligo, and about one in five people with the condition have at least one close relative who also has it. But genes alone don’t tell the whole story. Environmental triggers, physical stress, and other factors can set off the immune response in someone who is already genetically susceptible.
One well-documented trigger is skin trauma, known in dermatology as the Koebner phenomenon. Cuts, burns, sunburns, tattoos, piercings, insect bites, and even surgical incisions can cause new vitiligo patches to appear at the injury site. The new patches typically follow a linear pattern along the line of the wound. This doesn’t happen to everyone with vitiligo, but it’s common enough that dermatologists consider it when advising patients about skin care and sun protection.
The Two Main Types
Vitiligo generally falls into two categories that behave quite differently.
Non-segmental vitiligo is the more common form. Patches appear symmetrically on both sides of the body, such as both hands, both knees, or around both eyes. It tends to spread slowly, with new patches developing off and on throughout a person’s lifetime. Color loss can occur anywhere on the body, including the face, arms, legs, torso, and genital area.
Segmental vitiligo behaves differently. It affects only one side or one segment of the body, like one arm, one leg, or one half of the face. It spreads rapidly at first, usually over 6 to 12 months, and then stabilizes. Once it stops spreading, most people with segmental vitiligo don’t develop new spots. It almost always appears before age 30.
What Vitiligo Looks Like and How It’s Diagnosed
The hallmark of vitiligo is smooth, flat patches of skin that have lost their color. On lighter skin tones, the patches may be subtle in normal lighting but become much more obvious with sun exposure, since the surrounding skin tans while the vitiligo patches do not. On darker skin tones, the contrast is often more immediately visible.
Dermatologists typically diagnose vitiligo through a physical exam, sometimes using a tool called a Wood’s lamp. This handheld device emits ultraviolet light in a darkened room, causing depigmented skin to glow a bright blue-white. The lamp makes it easier to spot patches that might be hard to see with the naked eye, especially on fair skin, and helps distinguish vitiligo from other conditions that cause lighter patches.
Blood tests aren’t needed to diagnose vitiligo itself, but your doctor may order them to check for related autoimmune conditions, particularly thyroid disease.
Linked Autoimmune Conditions
Because vitiligo is driven by an immune system malfunction, people who have it are at higher risk for other autoimmune disorders. The most common overlap is with autoimmune thyroid disease. Between 21% and 40% of vitiligo patients test positive for thyroid antibodies, compared to about 1% of the general population. This is why routine thyroid screening is standard for people diagnosed with vitiligo.
Alopecia areata, an autoimmune condition that causes hair loss in round patches, also occurs more frequently. Studies have found it in roughly 5% to 15% of vitiligo patients, depending on the population studied. Other associations include type 1 diabetes and pernicious anemia, though these are less common.
Topical Treatments
For many people, the first line of treatment is a prescription cream applied directly to the affected skin. Corticosteroid creams can sometimes slow the spread of vitiligo and encourage some repigmentation, particularly in the early stages or on smaller patches.
A newer option became available in 2022, when the FDA approved a topical cream containing ruxolitinib for non-segmental vitiligo in patients 12 and older. This was the first medication specifically approved for vitiligo in the United States. It works by blocking a specific immune signaling pathway involved in the destruction of pigment cells. In long-term studies, patients who initially showed little improvement at 24 weeks continued to regain color with extended use. By two years, roughly half of patients achieved at least 50% repigmentation on total body patches, and about 55% achieved at least 75% repigmentation on facial patches. Results tend to come slowly, so patience is essential.
Phototherapy
Narrowband UVB phototherapy is one of the most established treatments for vitiligo, particularly when patches are widespread or spreading. It involves standing in a light booth that exposes the skin to a specific wavelength of ultraviolet light. The light stimulates any remaining pigment cells in and around the affected patches to produce melanin again.
Sessions are typically scheduled two to three times per week. Most treatment protocols recommend starting at three sessions per week for the first three months, then reducing to twice weekly. Repigmentation usually begins as small dots of color within the white patches, often around hair follicles where some pigment cells may still survive. The face and neck tend to respond best, while hands, feet, and bony areas like elbows and knees are slower to regain color. Treatment often continues for many months to a year or more.
Surgical Options for Stable Vitiligo
For people whose vitiligo has been completely stable for at least one year, with no new patches and no expansion of existing ones, surgical approaches can be effective. The most studied technique involves taking a small sample of pigmented skin, separating out the pigment-producing cells, and transplanting them onto the depigmented areas.
Success rates for this type of cell transplant are encouraging. Studies report that 89% of patients achieve 75% to 100% repigmentation in treated areas. However, the stability requirement is strict. If vitiligo is still active, transplanted cells are likely to be attacked by the same immune process that caused the original patches, making the procedure ineffective.
Emotional and Social Impact
Vitiligo is not physically painful or medically dangerous on its own, but its psychological effects can be significant. Visible patches on the face, hands, and arms can affect self-esteem, social interactions, and quality of life. The impact tends to be more pronounced in people with darker skin tones, where the contrast between affected and unaffected skin is greater, and in cultures where skin appearance carries strong social weight.
Many people with vitiligo report that the unpredictability of the condition, not knowing when or where new patches will appear, is as distressing as the patches themselves. Support groups, therapy, and connecting with others who have the condition can help. Cosmetic camouflage products designed to match surrounding skin tones also provide a practical option for covering patches when desired, without any effect on the underlying condition.