More than 5.4 million cases of nonmelanoma skin cancer were treated in people in the U.S. in 2012. In the U.S. more people are diagnosed with skin cancer than all other cancers combined. Nonmelanoma skin cancer is caused by exposure to UV rays, more specifically UVB rays. There are two types of UV rays, UVA and UVB. They stand for ultraviolet A and ultraviolet B. UVA rays are long-wave solar rays that penetrate the skin deeper and are connected to wrinkling and the aging skin. UVB rays are short-wave rays and penetrate the outer layer of your body directly and are the source of sunburns. UVB is also more connected to the cause of skin cancer. Exposure to UVB rays occur as soon as you step foot outside.