DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Discoloured nail. Toenail with melanonychia, a nail discolouration caused by melanin, a pigment normally found in skin, hair and eyes. It usually results from trauma, systemic disease, infection or medication. There are two types of melanonychia: transverse (across) or longitudinal (lengthwise, seen here). Longitudinal melanonychia may be a sign of subungual melanoma, a type of skin cancer that develops beneath the nail.
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