A more serious underlying cause of black toenails is malignant melanoma. However, this condition is rare. Subungual melanoma is a highly dangerous form of cancer, often manifesting as a dark line ...

A 57-year old woman had her pinky toe amputated after a dark spot she thought was a mole turned out to be skin cancer, TODAY reported. Yvonne Basil, of Dallas, Texas, said she had noticed the spot ...