Basal cell carcinoma, or BCC, is a cancer of the basal cells at the bottom of the epidermis. It is sometimes called a rodent ulcer. It is very common. About 75% (75 in 100) of all skin cancers in the UK are BCCs. Most BCCs are very slow-growing and almost never spread to other parts of the body. Nearly everyone with a BCC who has treatment is completely cured.
Occasionally some BCCs are aggressive, and, if left to grow, may spread into the deeper layers of the skin and sometimes to the bones. This can make treatment difficult.
A small number of BCCs may come back in the same area of skin after treatment. This is known as a local recurrence.