1. Melanoma is a malignant tumor of melanocytes that can arise in the skin or other parts of the body. 2. Risk factors for melanoma include excessive exposure to UV radiation, fair skin, and family history. 3. There are several types of melanoma including superficial spreading, nodular, lentigo maligna, and acral lentiginous melanoma. 4. Prevention strategies include avoiding sun exposure, wearing protective clothing, and eating a diet high in antioxidants. Medical treatment options include immunotherapy, chemotherapy, radiation therapy, targeted therapy and biologic therapy.