Skin cancer is the proliferation of malignant cells that invade tissues. Usually they manifest through changes in pigmentation or texture of a mole or spot on the skin, red, scaly spots, skin lesions that do not heal after a few days and having discoloration. To prevent and detect skin cancer readers are referred to the dermatologist in the presence or manifestation of these skin changes to determine the degree of malignancy or benignity of such abnormalities. Skin cancer can be of two types: non-melanoma and melanoma. The non-melanoma is the most common and includes all cancers except malignant melanoma, which is more serious. For melanoma, treatment requires surgical removal of the affected tissue (which may even include nearby lymph nodes), even in cases where it has spread to other organs usually no cure. In these patients, several therapies are usually applied to shrink the tumor, such as chemotherapy and immunotherapy. For other types of skin cancer, such as carcinoma, treatment may include various techniques: chemotherapy, radiation therapy, photodynamic therapy, Mohs surgery, laser surgery, etc.