Skin cancers are malignancies that develop in the skin. They develop as a result of the proliferation of abnormal cells, which can invade or spread to different parts of the body. The three main types of skin cancer are basal-cell skin cancer (BCC), squamous-cell skin cancer (SCC), and melanoma. The first two together with many less common skin malignancies are referred to as nonmelanoma skin cancer (NMSC). Basal-cell carcinoma has a slow pace of development, has the potential to damage adjacent tissue, but is not likely to spread to other organs or be deadly. It typically appears as an ulcerated patch of raised skin that is bright and painless and has a little blood vessel running over it.