DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Giant pigmented naevus or mole, a skin lesion caused by an abnormality or overactivity of the melanocytes, the skin cells that produce the pigment melanin. Moles vary considerably in size, with the smaller type being more common & prolific. Adults have an average of 15-20 moles. They are unusual at birth & tend to appear in childhood & adolescence. On rare occasions they undergo malignant change to form a type of skin cancer called a malignant melanoma. Other types of pigmented naevi include freckles, cafe au lait spots and lentigos.
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