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Welcome to the DERMATOLOGY FORUM! Questions in this forum are answered by Dermatologists from St. Luke's Roosevelt Hospital, under the direction of Andrew Alexis, M.D., M.P.H.
Makes no sense to me at all. Fungus doesn't look blackBlack cohosh Black draught Black haw, and certainly doesn't appear on 5 nails overnight. And if there was blood under the nail from trauma, it would take 3-4 months to grow out. My advice is to photograph it when it happens, in case it isn't there when you see the dermatologist. But it's not fungus.