Exposure to ultraviolet light—sunlight and tanning beds—is the main risk factor for skin cancer. Basal cell and squamous cell cancers are the most common types and are related to UV exposure adding up over the years. Melanoma—the deadliest form—is more strongly related to intense exposure and sunburn. Melanoma can occur anywhere on the skin, not just the sunburned area. Always check your whole body for changes in your skin, especially moles, but here are the most common skin cancer sites.