There are three main types of skin cancer that you should be familiar with. Most skin cancers are either basal cell or squamous cell carcinomas, which seldom become life threatening. Melanoma is much less common and if it is not found early and treated promptly, it could be very dangerous. However, if diagnosed early, melanoma can be cured. Therefore, it's important to recognize any changes in your skin and to report them to your doctor without delay.
Although unprotected exposure to the sun can cause melanoma, it may appear on skin that has not been exposed to the sun.