Information on skin cancer is available on the official websites of WebMD, Mayo Clinic and eMedicineHealth. These sites offer information concerning skin cancer causes, symptoms, treatments and risk factors, as noted on the websites.
Skin cancer is the most-common cancer, and more than 1 million people in the United States are diagnosed with the disease every year, according to eMedicineHealth. There are three major types of skin cancers: melanoma, basal cell carcinoma and squamous cell carcinoma. Malignant melanoma is an aggressive cancer that often spreads to other parts of the body; it can be fatal if it is not treated early.