Vitiligo has no symptoms in the usual sense. It does not itch or hurt. What people notice is a patch of skin that has gone pale and keeps getting paler.
The condition itself is identical across skin tones, but the impact is not. On brown and Black skin the contrast is stark, so the same amount of vitiligo is far more noticeable and carries much more social weight. On very fair skin, patches may only become obvious in summer when the surrounding skin tans, and are sometimes only picked up under a Wood's lamp. Depigmented skin has no protection from ultraviolet light at any skin tone, so it burns quickly and needs sunscreen.
Several things cause pale patches and they are not all vitiligo. See Lookalikes near the bottom of this page.
Vitiligo is autoimmune. The immune system, which is meant to attack infections, misidentifies melanocytes — the pigment-making cells — as a threat and destroys them. Where those cells are gone, no pigment is made, so the skin turns white. That is the whole mechanism, and it is why treatments that calm the immune system are the ones that work.
Why the immune system does this is not fully settled. Genetics load the dice: around one in five people with vitiligo has a relative with it, and dozens of genes affecting immune function have been linked to it. Something then appears to set it off — sunburn, a skin injury, a period of severe stress or an illness are common triggers people report, though a trigger is often never identified. Vitiligo also travels with other autoimmune conditions, thyroid disease most of all, which is why thyroid bloods are usually checked. What does not cause it: diet, hygiene, contact with someone who has it, or anything you did. There is no food that brings it on and no food that reverses it.
None of this repigments the skin, and it is not meant to. Sun protection and camouflage are practical, effective and legitimate parts of living with vitiligo, whether or not you are also treating it.
Vitiligo is worth getting looked at early, because new patches respond far better than old ones. Book an appointment if:
What the visit gets you: confirmation that it is vitiligo and not one of the several other causes of pale patches, which a Wood's lamp settles in seconds. A check for the autoimmune conditions that come with it. Access to the treatments that actually repigment — ruxolitinib cream, phototherapy and excimer laser are not things you can arrange yourself. And a realistic answer about which of your patches are likely to respond and which are not.
Vitiligo is usually clear on sight, but here two tests genuinely earn their place.
A Wood's lamp. A handheld ultraviolet light used in a darkened room. Vitiligo glows a bright chalky white under it, which does two things: it confirms the diagnosis by showing the pigment loss is total rather than partial, and it reveals patches that are not yet visible in normal light. That second part matters, because it shows the real extent of the condition and can change what treatment is offered. It takes seconds, it does not hurt, and nothing touches your skin.
Thyroid blood tests. Vitiligo is autoimmune, and autoimmune thyroid disease is the condition most often found alongside it. Checking thyroid function, and sometimes thyroid antibodies, is standard and reasonable. Some doctors also check a full blood count, vitamin B12 and vitamin D, or screen for diabetes, particularly if there are other symptoms.
A skin biopsy is occasionally done, but only when the diagnosis is genuinely unclear — for example when it is hard to separate from a scarring condition. It is not needed for typical vitiligo.
These are the treatments that actually bring pigment back. Which one you are offered depends on how much skin is involved, where the patches are, and your age. All of them take months, and none of them work as well on hands and feet.
Light-based treatment is the mainstay for widespread vitiligo, and surgery is an option for stable patches that have not responded. Both require a real time commitment.
Usually nothing visible. This is the hardest part of vitiligo treatment and the point most people stop. If a treatment is going to work, the earliest signs appear around month two or three.
Colour returns from hair follicles, so tiny dots of pigment appear inside the white patch and slowly widen. A patch fills in speckled and uneven before it fills in evenly. That speckling is good news, not a new problem. Returning colour is sometimes darker than your normal skin at first and evens out over months.
This is the realistic timescale for meaningful repigmentation, not weeks. Treatment is often continued for a year or more, and it works best on the face, neck and trunk.
Hands, fingers, feet, toes and lips respond poorly, because there are few hair follicles to bring pigment back from. Patches that have been white for many years, and patches where the hair has also turned white, are less likely to refill. This is worth knowing before you start rather than after.
Vitiligo is unpredictable. It can stay still for years, then spread, then stop again. Treatment can restore colour, but the immune tendency does not go away, so patches can return if treatment stops — which is why maintenance is often part of the plan. Some people choose not to treat at all, and that is a legitimate decision rather than giving up.
Vitiligo does not damage your health directly, and it does not turn into anything dangerous. The problems it does cause are worth naming.
Not every pale patch is vitiligo. The key question is whether the pigment is completely gone, or just reduced.