Answers include: Possible lint from sock, blood, normal variant or possible melanoma. Should be examined by a doctor. The latter is dangerous.
Answered 4/20/2013
5.2k views
Fungus or trauma: This could also be nail fungus or past trauma to the nail matrix causing discoloration of the nail form the point of trauma.
Answered 4/23/2013
5.2k views
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