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Hi I've had a thick black vertical line under my index fingernail for about four years now. What is it and how do I get rid of it?


Hello rach... there are many issues that may cause the problem of a vertical black line to run under your nail.  This could be due to aging or nutritional issues like lack of zinc or copper.  Also a fungal infection could be a cause or a heart valve infection by bacteria.  One thing that should lead you to a doctor appointment is that is could be a melanoma or cancer.  It would behoove you to go have it check out to make sure you do not have something serious going on with your health.  Hopefully, it's something simple like a fungal infection which can be treated easily.

Has anybody have a fingernail with the black line running through it?  What was causing it?