Skin cancer develops when a cell in the skin goes through a series of changes that make it a cancer cell. Exposure to ultraviolet (UV) radiation in sunlight is the main factor that causes skin cancer cells to become cancer cells.
Basal cell carcinoma, or BCC, is a cancer of the cells at the bottom of the skin's outermost layer.
Squamous cell carcinoma, or SCC, is a cancer of the cells at the bottom of the skin's outermost layer.
Melanocytes are the cells in the skin that produce melanin, which colours or pigments the skin. A melanoma starts from melanocytes.