Skin cancer is, by far, the most prevalent cancer that is diagnosed in the United States. Melanoma, which typically appears as an unusual mole, is the most dangerous, but thankfully also the least common. Other types of skin cancer, Basal Cell Carcinoma and Squamous Cell Carcinoma (both non-melanoma skin cancers), are the most common types of skin cancer. Over 5.4 million cases of non-melanoma skin cancer are treated in more than 3.3 million people each year in the U.S. Even more, treatment of non-melanoma skin cancers increased by nearly 77-percent between 1992 and 2006 and over the past three decades more people have developed skin cancer than all other cancers combined. Each year there are more new cases of skin cancer reported than colon, lung, prostate and breast combined.