Vitiligo is a chronic skin condition in which the body’s immune system destroys the cells responsible for skin color, leaving smooth white patches on the skin. It affects between 0.004% and 2.28% of the global population, depending on the region studied, and can appear at any age, though onset follows a two-peak pattern: commonly around age 7 in children and around age 40 in adults.
How Vitiligo Develops
Your skin gets its color from cells called melanocytes, which produce pigment in the outer layer of skin. In vitiligo, the immune system mistakenly identifies these melanocytes as threats and sends specialized immune cells to destroy them. This attack is driven largely by a type of white blood cell that directly kills melanocytes, along with an inflammatory signaling molecule that amplifies the immune response in affected areas.
The result is patches of skin that have lost all pigment. These patches are not scaly, raised, or painful. They’re simply white, with otherwise normal skin texture. The process involves a combination of genetic predisposition, environmental triggers, oxidative stress inside the melanocytes themselves, and the immune system’s overreaction. No single cause explains every case, but the autoimmune component is central.
Two Main Types
Vitiligo is classified into two primary types based on how and where the patches appear.
Non-segmental vitiligo is the more common form. Patches appear symmetrically on both sides of the body, such as both hands, both knees, or both sides of the face. 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.
Segmental vitiligo behaves differently. It affects only one side or one section of the body, like one arm or one side of the face. It spreads rapidly for about 6 to 12 months, then stabilizes. Once it stops, most people don’t develop new patches. Hair growing in affected areas often turns white as well, including eyebrow or eyelash hairs. Most people develop segmental vitiligo before age 30.
Common Triggers and Spread
Vitiligo patches can be triggered or worsened by skin injury, a reaction known as the Koebner phenomenon. Any damage that penetrates the outer layers of skin can cause new depigmented patches to form at the site of injury, typically within 10 to 20 days. This includes cuts, burns, sunburns, insect bites, piercings, tattoos, and even surgical wounds.
Severe emotional stress and chemical exposure (particularly to certain industrial chemicals found in hair dyes or cleaning agents) have also been linked to new patches appearing. For people with non-segmental vitiligo, the condition is unpredictable. It may remain stable for years and then suddenly spread, or it may progress steadily. There’s currently no reliable way to predict who will experience rapid progression.
How It’s Diagnosed
Doctors can usually diagnose vitiligo through a visual exam, but a tool called a Wood’s lamp makes the process more precise. This handheld UV light causes skin without melanin to fluoresce a bright blue-white with sharply defined borders, making patches far more visible than they are under normal lighting. This is especially useful on lighter skin, where early patches can be easy to miss.
Beyond initial diagnosis, the Wood’s lamp helps doctors assess whether the condition is stable or active, determine the true size of patches, and evaluate how well treatments are working. A skin biopsy is rarely needed but may be done if the diagnosis is unclear.
Linked Autoimmune Conditions
Because vitiligo is autoimmune in nature, it frequently overlaps with other autoimmune conditions. In a study of over 1,000 vitiligo patients, nearly 20% had at least one additional autoimmune disease. Thyroid disease was by far the most common, present in about 13% of patients. Alopecia areata (patchy hair loss) appeared in roughly 4%. Less common but still elevated were inflammatory bowel disease, pernicious anemia, and lupus.
If you’re diagnosed with vitiligo, your doctor will likely check your thyroid function through a blood test, even if you don’t have symptoms. This screening is routine and worth doing, since thyroid problems are treatable and easy to miss early on.
Treatment Options
Vitiligo treatments aim to restore lost pigment or halt further spread. No treatment works for everyone, and results are gradual.
Phototherapy using narrowband UVB light is one of the most established approaches. It involves exposing affected skin to a specific wavelength of UV light, either in a clinic or with a home device, several times per week. The typical course runs 9 to 12 months, producing roughly 40% to 50% repigmentation on average. Combining phototherapy with a topical steroid cream modestly improves results, though even with combination treatment, about 27% of patients in one study achieved what was considered treatment success at nine months. It works, but slowly and partially for most people.
In 2022, the FDA approved the first topical treatment specifically for vitiligo repigmentation: a cream containing a JAK inhibitor (sold as Opzelura) for patients aged 12 and older. This medication works by blocking the immune signaling pathway that drives melanocyte destruction. In clinical trials, 30% of patients using the cream achieved at least 75% improvement in facial vitiligo scores after 24 weeks, compared with 10% on placebo. It’s applied twice daily and is most effective on the face and neck, with slower results on hands and feet.
Topical corticosteroids and calcineurin inhibitors (non-steroidal anti-inflammatory creams) remain first-line options for limited patches, particularly in children or for facial vitiligo where prolonged steroid use is a concern. For stable vitiligo that hasn’t spread in a year or more, surgical options like skin grafting can transplant healthy melanocytes into depigmented areas.
Living With Vitiligo
Vitiligo is not contagious, not painful, and does not affect overall physical health beyond the pigment loss itself. But the cosmetic and psychological impact can be significant, particularly for people with darker skin tones where the contrast between affected and unaffected skin is most visible. Studies consistently link vitiligo to higher rates of anxiety, depression, and social avoidance.
Sun protection matters more with vitiligo. Patches without melanin burn easily and have no natural UV defense, so sunscreen on exposed patches helps prevent burns and may reduce the Koebner response that triggers new spots. Some people use cosmetic camouflage products or self-tanners to reduce the visibility of patches. Dihydroxyacetone, the active ingredient in most self-tanners, colors the outer layer of skin temporarily and works on depigmented areas, though it won’t match perfectly.