Basal cell carcinoma is the most common form of skin cancer in the U.S. These cancers almost never spread (metastasize) to other parts of the body. They can, however, cause damage by growing and invading surrounding tissue. Most skin cancers appear after age 50, but the sun's damaging effects begin at an early age. Therefore, protection should start in childhood in order to prevent skin cancer later in life. Follow the links below to find WebMD's comprehensive coverage about how a basal cell carcinoma is contracted, what it looks like, how to treat it, and much more.