A melanoma usually develops from an existing mole. Melanoma is not as common as the other two types of skin cancer, but it is more serious and its treatment is different. Melanoma is explained in a separate handout. Some diseases and some chemicals increase a person's risk of developing skin cancer. Also, if you have another type of cancer, the cancer may spread to your skin.
Many skin cancers occur on the face, but they can appear anywhere on the skin.
Skin cancer that is untreated or partially treated may result in more severe cancer problems. If you have previously had skin cancer, you are at a higher risk for developing skin cancer again. Skin cancers may recur in the same location. Also, see your doctor if you discover any new changes on your skin. The effects will last as long as the cancer cells exist and grow.