There are many forms of skin cancer, of which the most common are basal cell carcinoma, squamous cell carcinoma including keratoacanthoma, and melanoma. It tends to affect those with fair skin, but can be seen in skin of color as well. Bob Marley had acral lentiginous melanoma, which is a form of melanoma that occurs on the soles of the feet.
Skin cancer can be diagnosed by a board-certified dermatologist, and can be caught in its earliest form by a dermatologist who is trained in dermoscopy. Dermoscopy is the use of a hand-held microscope which magnifies the structures of the skin.
The cause of skin cancer may be multifactorial and include exposure to ultraviolet (UV) light from the sun or from tanning beds, smoking, genetics, arsenic exposure, drug-induced immunosuppression, or it may present in a long-standing wound or scar. Certain genetic conditions may also have an increased risk of skin cancer, including albinism, Basal cell nevus syndrome (Gorlin syndrome), and Xeroderma pigmentosum. Treatment for skin cancer depends on the type and stage of the cancer, but may include surgery, topical treatments, electrodessication and curretage, and sometimes chemotherapy. Wearing sun-protective clothing, applying sunscreen, regular skin checks, avoiding tanning beds, and limiting sun exposure during peak hours (10am-4pm) are all measures that can help to prevent skin cancer.