Skin cancer is a disease in which cancer (malignant) cells are found in the outer layers of the skin. Skin protects your body against heat, light, infection, and injury. It also stores water, fat, and vitamin D. The skin has two main layers and several kinds of cells. The top layer of skin is called the epidermis. It contains three kinds of cells: flat, scaly cells on the surface called squamous cells; round cells called …showed first 75 words of 1061 total…

…showed last 75 words of 1061 total…cancer cells outside the skin. Systemic chemotherapy is being tested in clinical trials. Biological therapy tries to get your own body to fight cancer. It uses materials made by the body or made in a laboratory to boost, direct, or restore the body's natural defenses against disease. Biological therapy is sometimes called biological response modifier (BRM) therapy or immunotherapy. Photodynamic therapy uses a certain type of light and a special chemical to kill cancer cells.