A black line on your nail (medically known as melanonychia) causes a streak of dark pigmentation that runs along the nail bed. It can be a normal color variation, especially in people with darker ...

But the lines were still there. Kennedy News & Media Tagliamonte went to a dermatologist, who told her the “discoloration at the base of my thumb nail ... this black line in my nail was coming ...

The infection can grow and spread to your nail bed. Toenails may appear white and ... so it may take some time for the white spots or lines to disappear entirely. Fingernails typically take ...