Subungual melanoma (aka nail melanoma) is, as its nickname suggests, a skin cancer that occurs under the nail. It affects 0.7 to 3.5% of people with melanoma, according to the Journal of the ...
However, dark stripes shouldn't be ignored because “it can sometimes be a form of skin cancer that affects the nail bed ... cases are diagnosed in people under the age of 50.
Skin cancer is an accelerated growth of abnormal skin cells that requires prompt treatment. There are several different types of skin cancer, each with varying levels of complexity and severity.