Basal cell carcinoma is the most common form of skin cancer worldwide. In the majority of cases, it is thought to be caused by exposure to the harmful ultraviolet (UV) rays of the sun. Basal cell carcinoma is becoming more common, perhaps because people may be spending more time outdoors and the decrease in the ozone layer may be allowing more UV radiation from the sun to reach the earth’s surface. Basal cell carcinoma does not usually metastasize or spread in the bloodstream to other organs; rather, it infiltrates the surrounding area destroying tissue. For this reason, a dermatologist should treat basal cell carcinomas promptly.