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Cancer always starts in the cells, which make up the tissue that is found in the skin and throughout the body. Cells have a life of their own – they grow and mature and eventually die off, at which point they’re replaced. Sometimes, though, something goes haywire – new cells might form even though the body doesn’t need them, and sometimes old or damaged cells don’t die off as they’re supposed to. When this happens, cells start growing wild. All the extra cells build up and form a mass of some sort that’s called a lump, growth a tumor.