DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Intradermal naevus. A pigmented skin blemish, known as an intradermal naevus, seen on human skin. The ruler beside it measures centimetres. This brown blemish is caused by overactivity or abnormality of melanocyte pigment cells in the dermis of the skin. Intradermal naevi are the most common type of naevi found in adults. Most naevi are harmless and do not require treatment; however, those that suddenly appear, grow or change colour may be associated with skin cancer.
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