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I have a black line on one of my toenails. It's been there for a while and I don't think it's a bruise. What should I do?

If you have a black line on one of your toenails that has been there for a while and doesn't seem to be a bruise, it could be a sign of a more serious condition. It is best to consult a doctor to have a complete medical evaluation and determine the cause of the black line on your toenail.