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Melanonychia

Dark or black colouration of a toenail or fingernail, caused by an excess of the pigment melanin. The colour usually forms a vertical streak down the nail.

Melanonychia is widespread in certain Asian and black people. In Caucasian people, it can be brought on by a naevus (pigmented blemish) underneath the nail; melanoma; HIV infection; or reaction to a rug.


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