DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Pigmentation by sunburn. View of dark patches of skin on the back of a 35 year-old man caused by childhood sunburn. Skin is coloured by a pigment known as melanin produced by melanocyte cells in the skin. Lighter-skinned people produce less melanin that darker skinned people. In cases of severe sunburn, the pigmentation of the burned skin can be permanently altered by the effects of overexposure to sunlight.
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