Figure 3: Ultraviolet radiation induced squamous cell carcinoma on the left ear and mastoid process. Squamous cell skin cancers erode tissue locally, can be quite disfiguring, and can spread or metastasize distantly to other organs. Source: US Centers for Disease Control and Prevention (CDC) No copyright permission required. Available at http://www.cdc.gov/excite/skincancer/mod10.htm.