BSIP MARIGAUX / SCIENCE PHOTO LIBRARY BSIP MARIGAUX / SCIENCE PHOTO LIBRARY
Pigmented mole. Close-up of a pigmented mole below a pair of lips. A mole is a type of naevus, a pigmented area of skin caused by overactivity of the melanocyte cells. These cells are responsible for producing melanin, a dark pigment which gives hair and skin its colour. Most naevi are harmless, but occasionally one may turn cancerous. This change is betrayed by itching, growth of, and bleeding from, the naevus. In such a case, the naevus should be surgically removed as soon as possible.
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