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BCC almost never spreads to another part of the body and starts growing there. If it does happen, it is called secondary cancer, or metastasis.
However, if BCC is left untreated for many years, it gets bigger. It may become raw and crusted (called ulceration). It can develop to make a deep hole in the skin and to destroy the body tissue around it.
Although secondary BCC is rare, if you have had a BCC before, it does increase your risk of getting another primary BCC.
