DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Vitiligo. Area of light skin on the arm of a 15 year old boy. This is vitiligo, a condition that causes an area of skin to lose its pigment. It most commonly occurs on the face, hands, armpits and groin. It is thought to be the result of an autoimmune disease that causes an absence of melanocytes, the cells that produce the skin's pigment. In mild cases no treatment is necessary. More severe cases can be treated with phototherapy or, if large areas are affected, the use of chemicals to remove the pigment from the areas of normal skin.
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