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I have black line on my thumb nail is it harm full or normal. I see it for long times neither I feel any pain or any other problem? What it exactly is? And what should I do for that?

1 Doctor Answered
Hello lybrate-user! the black lines on nails are mostly innocent and benign unless there is a change in colour, sudden change in size, any ulceration or bleeding. Just keep a close look for the changes. Otherwise no reason to worry.
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