This summer, Charmaine Sherlock noticed a thin black line under her nail of her left thumb — what looked like a splinter growing from her cuticle. She thought perhaps she was having an autoimmune ...

Melanonychia, also known as a dark or black line on the nail, causes a streak of dark pigmentation that runs along the nail ...

Charmaine Sherlock thought maybe the thin black line from her cuticle was an autoimmune reaction. She soon learned it was an aggressive subungual melanoma. This summer, Charmaine Sherlock noticed a ...