Racial melanonychia is an increase of melanocytes within the nail matrix that can cause black lines on the nails. Melanocytes ...

It’s caused when cells in the nail bed create too much melanin, cells that cause color in things like your skin, hair, and eyes. Subungual melanoma develops under the toenail and, depending on ...

Melanoma is a type of skin cancer that starts in the epidermis, the top layer of skin. Specifically, this type of cancer affects the melanocytes, the cells that give your skin its pigmentation or ...