Vitiligo is a chronic skin condition characterized by portions of the skin losing their pigment.
It occurs when skin pigment cells die or are unable to function. Aside from cases of contact with certain chemicals, the cause of vitiligo is unknown.
The only sign of vitiligo is the presence of pale patchy areas of depigmented skin which tend to occur on the extremities. The patches are initially small, but often grow and change shape.
There is no cure for vitiligo but several treatment options are available including applied steroids and a combination of phototherapy with creams.