Information on skin cancer can be found at the websites of the American Cancer Society and the Skin Cancer Foundation. This includes facts, the answers to commonly asked questions and, in the case of the latter resource, images of problematic abnormalities on the skin, such as melanoma and dysplastic nevi. Skin cancer is the most common type of cancer in the United States, according to both sources.
The most common type of skin cancers are basal cell, squamous cell and melanoma, according to the American Cancer Society. For each of the skin abnormalities displayed as images on the Skin Cancer Foundation website, there are pages detailing warning signs, causes and risk factors, treatments and guidance on preventative measures that can be taken.