Skin cancer is a form of malignancy that begins when skin cells grow abnormally and uncontrollably. It most commonly develops in areas exposed to sunlight, such as the face, neck, arms, and hands, but it can occur anywhere on the body. Originating in the epidermis, the outermost layer of the skin, it can spread deeper into tissues or even to other organs if not treated in time. While many types are slow-growing and highly treatable, certain forms like melanoma can be aggressive and life-threatening, making early detection and awareness crucial for effective management.