Melanonychia: What It Is, Causes, and More

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Melanonychia occurs when you have brown or black lines in your nails. Learn about melanonychia, including the types and causes.
Do you have black or brown lines on your nail? This video explains what melanonychia is, what causes it, and how it can be treated.

Friction – a cause of melanonychia

I have linear melanonychia, which causes dark vertical lines on my

Melanonychia: What It Is, Causes, and More

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Longitudinal melanonychia