Excessive exposure to ultraviolet (UV) radiation is a significant cause of skin cancer. To minimize exposure, the American Cancer Society suggests the following: stay in the shade during the hours of 10 AM and 4 PM when UV rays are the strongest; wear sunscreen when outside at all times; wear clothes that cover most of your skin; wear a wide brimmed hat to protect you head, neck, and face; and wear sunglasses that are designed block dangerous UV rays.
American Cancer Society, November 2017