A slide show of pictures of melanoma, a form of skin cancer, is published on Mayo Clinic's website, and a slide show displaying different types of skin cancer is published on Healthline. There are several different types of skin cancer, including melanoma, basal cell carcinoma and squamous cell carcinoma.
Without treatment, skin cancer can spread to lymph nodes, bones and other organs, states Healthline. Skin cancer affects 20 percent of Americans in their lifetimes. Melanoma is the least common but most deadly type of skin cancer. Melanomas account for 75 percent of all skin cancer deaths.
Cases of melanoma that are caught early are often successfully treatable, according to Mayo Clinic. Moles and lesions on skin that are asymmetrical, have irregular borders, change in color, have a diameter greater than 6 millimeters and evolve or change should be evaluated for melanoma.
Actinic keratosis, a precancer, usually looks like a rough patch of skin on a part of the body not usually covered, according to Healthline. This type of skin lesion can turn into squamous cell carcinoma but is more likely to become basal cell carcinoma. Basal cell carcinomas account for approximately 80 percent of all skin cancer cases. These carcinomas are waxy and pink in their appearance and raised in texture. Squamous cell carcinoma is more red than pink and feels rough and scaly.