Carcinoma is a kind of cancer that expands from epithelial cells. Particularly, a carcinoma is a cancer that starts in a tissue that lines the inner or outer surfaces of the body, and that usually arises from cells originating in the endodermal or ectodermal germ layer during embryogenesis. Carcinoma is a cancerous enlargement. Carcinoma is a skin cancer. Carcinoma happens in the epithelial tissues. The cells layers are created by this epithelium tissue.