Melanonychia, also known as a dark or black line on the nail, causes a streak of dark pigmentation that runs along the nail ...

(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 ...

This is an archived article and the information in the article may be outdated.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. (NEXSTAR) – What started out as a “tiny ...