Black line on the nail: Causes, treatments, and pictures

A look at a black line on the nail, a common change that can happen due to a range of causes. Included is detail on the diagnosis and when to see a doctor.

A dark brown spot appeared on my skin overnight between my fingers. What is it? - Quora

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Black Lines on Nails: Causes and Treatments

Why is there a dark line on my big toenail? I don't know how long it's been there but I'm very concerned. - Quora

Why do I have weird lines on my nails? They look like offsets of my nail tips. - Quora

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Subungual Melanoma Fingernail Cancer - Causes, Symptoms

What is this black line on my thumb nail? - Quora

What is this black line on my thumb nail? - Quora