Melanonychia, a black line on your nail, can be a sign of melanoma or benign pigmentation changes. Injuries, medications, and conditions like hyperthyroidism may also cause dark lines on your nails.

(Gray News) - A brown line on a mother’s fingernail turned out to be a rare form of melanoma, according to the Cleveland Clinic. Lauren Koltcz, 45, said she noticed a brown streak on her thumbnail one ...

(NEXSTAR) – What started out as a “tiny little brown line” on one woman’s fingernail led to a rare, potentially life-threatening medical condition, one that she’s now trying to help others catch early ...

If you are staring at a dark spot under your fingernail, you may want to see a dermatologist. It could be a form of melanoma. "It is rare, and it's scary that it's rare, because a lot of people would ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. What started out as a “tiny little brown ...