Progressively enlarging scar resulting from formation of excessive amounts of collagen in the dermis during connective tissue repair; spreads to surrounding tissues.

Keloid, also known as keloid disorder and keloidal scar, is the formation of a type of scar 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 III) at the site of a healed skin injury which is then slowly replaced by collagen type I...