Skin cancer is one of the most common types of cancer.
It is a tumor, an uncontrolled growth of abnormal cells, on the skin. The skin appears to change in texture or color and a sore or nodule may develop on your skin. It is more common in occupations with prolonged sun exposure. Basal cell carcinoma develops slowly and causes a lump or a small, painless, smooth-edged ulcer. It most often occurs on the face, head, and neck.