Skin cancer is a disease in which malignant cells are found in the outer layers of the skin.
Skin cancers affect approximately 600,000 Caucasians every year. Most people receive 80 percent of their lifetime exposure to the sun by 18 years of age. Energy from the sun reaches the earth as visible, infrared, and ultraviolet rays . The main source of UV radiation is sunlight. Only UVA and UVB ultraviolet rays reach the earth's surface.