A dermatologist has warned that a specific mark on your nail could be a sign of a serious health problem – so it's important ...

Dermatology Nursing. 2007;19(1):83-84. Athletes may develop sports-related subungual hematomas. Repeated trauma to the nail bed occurs each time the toe contacts the inside of the sneaker.

However, according to the American Academy of Dermatology Association (AADA), it can also form under and around the nails, a condition known as subungual melanoma. This rare type of melanoma is ...