MID ESSEX HOSPITAL SERVICES NHS TRUST / SCIENCE PHOTO LIBRARY MID ESSEX HOSPITAL SERVICES NHS TRUST / SCIENCE PHOTO LIBRARY
Mole on right leg of an 18-year-old man. Also known as a pigmented, melanocytic, or melanotic, naevus, this skin mark is caused by an abnormality or overactivity of the melanocytes, the skin cells that produce the pigment melanin. Moles vary considerably in size and appearance. They are unusual at birth and tend to appear in childhood and adolescence. For a close-up view of this mole being measured, see image C038/2289.
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