Images of skin cancer on legs can be found on the American Cancer Society's website. The site provides a gallery of skin cancer images noting the placement of each type of cancer and where it typically appears on the body.
The American Cancer Society mentions that melanoma is the most common type of skin cancer found on the legs of patients. Searching for images of melanoma may also provide images of skin cancer appearing on legs on other reliable websites, including WebMD and skincancer.org. Each of these resources also provides image galleries of skin cancer and its affected body locations.