Comment on WHAT'S UP DOC: Nail discoloration, melanonychia

WHAT'S UP DOC: Nail discoloration, melanonychia

Q: My friend has a vertical line-like discoloration on his nail. What is this from?A: Nails are made up of the same protein as skin (keratin), so in a way they can be thought of as hard translucent skin. Nails grow from the nail matrix under the cuticle, with the newer nail pushing the older nail forward.

 

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