Having a dark line on your fingernails or toenails is called melanonychia. The lines are brown or black and usually look like a stripe that begins at the bottom of your nail bed and continues to the ...

Melanonychia is a brown or black stain in your fingernail or toenail. You can have a dark line on one nail, a few nails, or all of your nails. The line is caused by the natural color in your body ...

Melanonychia is the term for dark pigmentation of the nails. The discoloration in the nails may be black or brown. Melanonychia can be a natural occurrence in people with dark skin, but it can also ...

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