blemish

blem·ish

noun \ˈblem-ish\

Definition of BLEMISH

: a mark of physical deformity or injury: as a : any small mark on the skin (as a pimple or birthmark) <blemishes symptomatic of acne> b : a defect of an animal (as a horse) that detracts from its appearance but does not interfere with its usefulness