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.

What does a brown straight line in the middle of the fingernail mean? - Quora

Suddenly, I got a black spot on my left first finger proximal nail fold. What could be the cause? - Quora

Clinical guidelines for the recognition of melanoma of the foot and nail unit, Journal of Foot and Ankle Research

Black Lines On Nails: Causes and Fixes

Is the Black Line on Your Nail Normal or Melanoma? How To tell

Why does a brown line appear on a fingernail? - Quora

Have you ever had dark black coloring in part of your fingernail that doesn't grow out? - Quora

Ridges in Fingernails: Causes and Treatments

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Evaluation of nail lines: Color and shape hold clues

Clinical guidelines for the recognition of melanoma of the foot and nail unit, Journal of Foot and Ankle Research

Black Toenail: Symptoms, Causes, and Treatment

What is Longitudinal Ridging?

Health From Nails: 10 Fingernail Problems to Watch for