DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
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Mole on the skin of a 17 year old girl. This type of mole is known as a pigmented spindle cell naevus. It is caused by the proliferation of melanocytes, the skin cells that produce the pigment melanin. Most moles are harmless but they can turn cancerous. This is usually indicated by a change in colour or size, or by them becoming itchy.
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