A black line on your nail (medically known as melanonychia) causes a streak of dark pigmentation that runs along the nail bed ...

In about two-thirds of people with nail melanoma, the main symptom is longitudinal melanonychia, a dark vertical streak or line under the nail plate. It may be thin or thick, and light brown to black.

Kelly Heather, 38, from Kent, first noticed a faint, dark line in the middle of ... melanoma and typically presents as streaks or bruises on the nail bed that do not heal or grow out.

Kelly Heather, 38, ended up needing brain surgery for a tumor — and it started as a discolored line on her fingernail Kelly Heather / SWNS (2) Kelly Heather, 38, first noticed a dark line on her ...

They show up as small dark marks under your nail plates and run in the same direction the nail grows. These reddish-brown streaks are 1-3 millimeters long and do not fade or blanch when you press ...