Skin cancer is a low-grade malignant growth of the skin that can be caused by factors like family history, radiation, moles, weak immune system, fair skin, age, HPV infection, and chemicals. Over 2.8 million cases of basal cell carcinoma are diagnosed each year, with about 90% of nonmelanoma skin cancers caused by UV radiation. One person dies of melanoma every hour, and risk doubles after five or more sunburns. Treatment options include radiotherapy, chemotherapy, surgery, immunotherapy, and photodynamic therapy.