About Basal Cell Carcinoma. Basal cell carcinoma is the most common type of skin cancer. It usually occurs on areas of the skin that have been in the sun, most often the nose.Often this cancer appears as a raised bump that looks smooth and pearly.bout Basal Cell Carcinoma. Basal cell carcinoma is the most common type of skin cancer. It usually occurs on areas of the skin that have been in the sun, most often the nose.