Melanonychia, a black line on your nail, can be a sign of melanoma or benign pigmentation changes. Injuries, medications, and ...

Add Yahoo as a preferred source to see more of our stories on Google. This summer, Charmaine Sherlock noticed a thin black line under her nail of her left thumb — what looked like a splinter growing ...

Beau’s lines are ridges that develop across the nails. They happen when nail growth is interrupted at the nail matrix. They can result from environmental factors and some medical issues. Most people ...

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 ...