A blemish is a small mark on something that spoils its appearance. Every piece is closely scrutinised, and if there is the slightest blemish on it, it is rejected
mar or spoil the appearance of; "scars defaced her cheeks"; "The vandals disfigured the statue"
an imperfection that is severe enough to be noticed but should not cause any real impairment with respect to intended normal or reasonably foreseeable use See also defect, imperfection, and nonconformity
A microscopic spot which may appear on film and is usually reddish or yellowish in color, sometimes termed aging blemish or microscopic spot The National Bureau of Standards Handbook 96 tabulates 6 blemish classifications