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A member asked:
My boyfriend has a black line on his thumb nail .. what does it mean ? how can it go away ? is it something to be worried about ? he hasn't smashed it
A doctor has provided 1 answer
Black line: This probably is going to last for a while. Unfortunately, there seems to be no explanation to the process. It won't hurt to check out with a dermatologist.
Answered 12/8/2020
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