<qa>  What is BCC?Basal cell carcinoma BCC is a malignant skin cancer that is believed to develop from the basal layer of the epidermis. Ultraviolet UV radiation is the primary cause of BCC. It induces local and systemic immuno-suppression, p53 mutations, pyrimidine covalent dimers in desoxyribonucleic acid DNA, and bcl-2 overexpression. All of these UV-induced changes are believed to be critical in the pathogenesis of BCC. 