Melanoma is the most dangerous type of skin cancer; it develops from the melanin-producing cells known as melanocytes.[1] It typically occurs in the skin, but may rarely occur in the mouth, intestines, or eye (uveal melanoma).[1][2] In women, melanomas most commonly occur on the legs; while in men, on the back.[2] Melanoma is frequently referred to as malignant melanoma. However, the medical community stresses that there is no such thing as a 'benign melanoma' and recommends that the term 'malignant melanoma' should be avoided as redundant.[7][8][9]

Reference
Wiki: Cutaneous melanoma