Vitiligo

Vitiligo (or leukoderma) is the patchy loss of skin pigmentation due to an auto-immune attack by the body's own immune system on skin melanocytes. It frequently begins in late adulthood, with patches of unpigmented skin appearing on extremities. The patches may grow or remain constant in size. Occasional small areas may repigment as they are recolonised by melanocytes. The population incidence is between 1% and 2%.

In some cases, mild trauma to an area of skin seems to cause new patches - for example around the ankles (caused by friction with shoes or sneakers). Vitiligo may also be caused by stress that affects the immune system, leading the body to react and start eliminating skin pigment.

The condition is medically harmless, other than the problem that the affected skin areas have no protection against sunlight - they burn but never tan. However, if the skin is naturally dark, the visual effect of the white patches may be considered disfiguring by some. (If the affected person is of pale-skinned ancestry, the patches can be at least be made less visible by avoiding sunlight and the tanning of unaffected skin.)

In some cultures there is a stigma attached to having vitiligo. Those affected with the condition are sometimes thought to be evil or diseased and are sometimes shunned by others in the community. People with vitiligo may feel depressed because of this stigma or because the way their skin looks is a dramatic change.

Steroids have been used to remove the white patches, but they are not very effective. Other more dramatic treatments include chemically treating the patient to remove all pigment from the skin to present a uniform skin tone. Current experimental treatments include exposure to narrow-band UV light, which seems to blur the edges of patches, and lightly freckling the affected areas. These treatments alter the appearance but do not address the underlying cause of vitiligo.

Among prominent persons known to have the condition is singer Michael Jackson, who has stated that he uses light-coloured makeup to even out his blotchy complexion. There may be many others; however, the patches (in mild cases) can be easily hidden with makeup or other cosmetic solutions.