Skin cancers are the cancer that arises from the skin. They are due to the development of abnormal cells that have the ability to spread to other parts of the body. Skin cancers are two types Melanoma and Non-Melanoma. Melanoma is the least common, but most aggressive of the two types of skin cancer. Melanoma originates in melanocytes-the cells in the skin that produce melanin. Non-melanoma skin cancer is the most common form of skin cancer.