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Patent Pending A keloid (/ˈkiːlɔɪd/; also keloidal scar)[1] is the formation of a type of scar[citation needed] which, depending on its maturity, is composed mainly of either type III (early) or type I (late) collagen. It is a result of an overgrowth of granulation tissue (collagen type 3) at the site of a healed skin injury which is then slowly replaced by collagen type 1.