Both a bane to runners and—in some strange way—a badge of honor, the black toenail, or subungual hematoma, is actually blood collecting underneath your nail. It can occur from acute or chronic injury, ...

Thanks Andrea for the excellent question. There are no articles I’ve read that find that people are prone to black nails. Perhaps we need a better understanding. Bleeding that occurs under a toenail ...

Thick, yellow toenails left so long they split and crumble. Nails so misshapen they dig into the skin, causing infections. Or, in the most severe cases, curling into what we call ‘ram’s horns’ that ...