Medically reviewed by Susan Bard, MD A black line on the nail could be normal, such as when it is just a color variation.

When David Edges's wife spotted a faint brown line on his toenail, he didn't think it was anything to worry about. But Kelly, ...

Find 15 black manicure ideas for when you want a dark, moody manicure, from French tips to matte accents and glitter.