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Light patches on the skin
White or lighter patches: not necessarily vitiligo, and the difference matters.
In everyday language any whitish area on the skin is called "vitiligo". It is understandable — it is the name everyone knows — but skin can become lighter through different mechanisms, and telling them apart is the first step of any serious assessment.
The fundamental distinction is between hypopigmentation and depigmentation. In hypopigmentation an area contains less pigment than the surrounding skin: it can appear, for example, after an inflammatory process has resolved. In depigmentation the pigment is essentially absent, and this is what happens in vitiligo, where functional loss of melanocytes produces areas in which melanin production is greatly reduced or absent.
Between the two lie many other possibilities. Post-inflammatory outcomes, some superficial infections such as pityriasis versicolor, pityriasis alba and other dermatological conditions can all present with lighter patches. The exact colour, the edges, the presence or absence of scaling and the distribution on the body all help to distinguish them.
As with dark patches, colour is only the starting point: "white" is not a diagnosis. A dermatitis can temporarily leave a lighter area after the inflammation has resolved, and that patch has nothing in common with vitiligo except its colour. Vitiligo has its own pathophysiology and its own clinical distribution, and is one of the possibilities — not the only one, and not the most frequent.
Is pigment reduced or absent? Not the same question
It is the first thing the dermatologist tries to establish, and it changes everything that follows. An area with less pigment than normal and an area where pigment is missing are different pictures, with different causes and different pathways — even if to the naked eye they can look very much alike. Edges, scaling, distribution and the history of the patch are what separate them, and these are assessed by looking, not by describing.
How it shows
- Areas of skin lighter than those around them
- Variable colour: from clearly whitish to simply paler
- Edges sometimes sharp, sometimes blurred
- Presence or absence of fine superficial scaling
- Appearing after resolved inflammation, or with nothing preceding it
- More noticeable after sun exposure, as the surrounding skin tans
How we proceed
- 1Dermatological visit: when the patch appeared and what preceded it
- 2Examination of colour, edges and the presence of scaling
- 3Assessment of distribution on the body, which is itself information
- 4Distinction between hypopigmentation, depigmentation and post-inflammatory outcomes
- 5Assessment and, on that basis, definition of the pathway
Available treatments
- Dermatology visit
- Diagnostic assessment
- Distinction between hypo- and depigmentation
- Assessment of post-inflammatory outcomes
- Definition of the pathway
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Frequently asked questions
Is a light patch vitiligo?+
Not necessarily, and statistically often not. Vitiligo is one of the possible causes of light patches, but post-inflammatory outcomes, pityriasis versicolor, pityriasis alba and other conditions can produce lighter areas that resemble it. Telling them apart requires looking at colour, edges, scaling and distribution: these are assessed at the visit.
What is the difference between hypopigmentation and depigmentation?+
In hypopigmentation the pigment is present but reduced compared with the surrounding skin: the area is paler. In depigmentation the pigment is essentially absent, and this is what happens in vitiligo, where melanocytes lose their function. It is the starting distinction because causes and pathways differ.
It appeared after a dermatitis cleared: is it related?+
Most likely yes. An inflammatory process that resolves can temporarily leave the area lighter than the rest: this is a post-inflammatory outcome, and it generally recovers on its own over time. It is still worth having it looked at, because the history — what was there before, how long ago, where — is what allows it to be attributed with reasonable confidence.
Why are they more noticeable in summer?+
Because the contrast increases. Areas with less pigment do not tan like the surrounding skin, so after sun exposure the difference becomes far more visible — even when nothing has changed. This is why many people notice them, or think they have worsened, on returning from holiday.
Related reading
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