The most recognizable sign of vitiligo is smooth, flat patches of skin that have lost their color, typically appearing lighter or completely white compared to surrounding skin. These patches can show up anywhere on the body but tend to appear first on areas exposed to the sun or subject to friction, such as the hands, face, and arms. Vitiligo affects roughly 0.5% to 1% of the global population and can develop at any age, though most people notice the first patches before age 30.
What the Patches Look Like
Vitiligo patches are areas where the skin has lost its pigment-producing cells. The affected skin is not raised, scaly, or rough. It feels identical to the surrounding skin, just lighter. On lighter skin tones, the patches may be subtle and only noticeable in direct sunlight or under ultraviolet light. On darker skin tones, the contrast is more striking, and patches are often visible immediately.
The edges of vitiligo patches can vary. Some have sharply defined borders where pigmented skin meets depigmented skin. Others show a more gradual transition, with a zone of intermediate color at the margins. Over time, patches may stay the same size, slowly expand outward, or merge with nearby patches to form larger areas of color loss.
Where Patches Tend to Appear First
Vitiligo most commonly starts on the hands, fingertips, wrists, around the eyes, and around the mouth. It also frequently appears around body openings like the nostrils and genitals, and in areas that experience repeated rubbing or pressure, such as elbows, knees, and the tops of feet. The scalp can be affected too, sometimes producing a streak of white hair before any skin color change is obvious.
Signs Beyond the Skin
Color loss from vitiligo isn’t limited to the skin’s surface. Several lesser-known signs can appear alongside or even before visible patches:
- Premature graying of hair. White or gray hairs on the scalp, eyebrows, eyelashes, or beard, especially before age 35, can be an early indicator. This happens when pigment cells in hair follicles are affected.
- Color loss inside the mouth or nose. The tissues lining the inside of the mouth and nose can lose pigment, turning lighter pink or white in patches.
- Color change in the eyes. Some people notice a change in the color of the inner layer of the eye, though this is less common and usually doesn’t affect vision.
Symmetric vs. One-Sided Patterns
Vitiligo follows two distinct patterns that look quite different from each other.
The most common form, called non-segmental vitiligo, produces patches on both sides of the body in a roughly symmetric arrangement. If a patch appears on one hand, a matching patch often develops on the other. If a spot forms near the center of the body, it tends to grow across the midline and involve both sides. This type spreads slowly, with new patches developing off and on over a person’s lifetime.
Segmental vitiligo is less common and behaves differently. It affects only one area on one side of the body, such as one arm, one leg, or one half of the face, without crossing the midline. It spreads rapidly for about 6 to 12 months, then stops. Once it stabilizes, most people with segmental vitiligo don’t develop new spots. Hair in the affected area often turns white as well.
The Koebner Response: New Patches After Skin Injury
People with vitiligo sometimes notice new patches forming exactly where their skin was injured. A sunburn, a scratch, a cut, or even the friction from a tight waistband can trigger color loss in that precise location. This reaction, known as the Koebner phenomenon, produces patches that look identical to the person’s existing vitiligo but appear along the line or shape of the injury. Tattoos, piercings, insect bites, and surgical scars can all serve as triggers. If you’re noticing new patches of color loss in areas where your skin was recently damaged, this response is a strong indicator of vitiligo rather than another condition.
What Causes the Color Loss
Vitiligo is an autoimmune condition. The immune system mistakenly identifies the body’s own pigment-producing cells as threats and destroys them. Specialized immune cells attack these pigment cells directly, releasing chemicals that kill them and trigger local inflammation. At the same time, the pigment cells in vitiligo patients tend to accumulate higher-than-normal levels of damaging molecules (a form of oxidative stress), making them more vulnerable to this immune attack. The combination of an overactive immune response and weakened cellular defenses drives the progressive loss of skin color.
Conditions That Look Similar
Several skin conditions can mimic vitiligo, and telling them apart matters for getting the right treatment.
Tinea versicolor is a common fungal infection that creates lighter patches on the skin, but these patches are usually slightly scaly and have a more tan or pinkish tone rather than the pure white of vitiligo. Pityriasis alba, often seen in children, causes pale, slightly rough patches primarily on the face and arms that typically resolve on their own. Postinflammatory depigmentation can follow eczema, burns, or other skin injuries, producing lighter areas where inflammation occurred, but these usually regain color over months.
A doctor can often distinguish vitiligo from these conditions through a simple examination using ultraviolet light. Under this light, vitiligo patches glow a bright blue-white, which helps confirm complete pigment loss versus the partial pigment loss seen in other conditions.
Linked Autoimmune Conditions
Because vitiligo is driven by an immune system malfunction, it frequently overlaps with other autoimmune conditions. A 10-year retrospective study found that 23% of vitiligo patients had at least one additional autoimmune disorder. Thyroid disease is the most common companion, affecting anywhere from 2% to 37% of people with vitiligo, compared to just 1% of the general population. Other associated conditions include alopecia areata (patchy hair loss), type 1 diabetes, rheumatoid arthritis, and lupus.
This doesn’t mean vitiligo causes these conditions or vice versa. It means the same type of immune dysfunction that attacks pigment cells can also target other tissues. If you’ve been diagnosed with vitiligo, thyroid screening is a reasonable step, and unexplained fatigue, joint pain, or other new symptoms are worth mentioning to a doctor in the context of your diagnosis.