defect -
an imperfection in an object or machine; "a flaw caused the crystal to shatter"; "if there are any defects you should send it back to the manufacturer"
visual aspect,
appearance the act of appearing in public view; "the rookie made a brief appearance in the first period"; "it was Bernhardt's last appearance in America"
birthmark,
nevus a blemish on the skin that is formed before birth
chatter mark a mark made by a chattering tool on the surface of a workpiece
stigma a skin lesion that is a diagnostic sign of some disease
verruca,
wart (pathology) a firm abnormal elevated blemish on the skin; caused by a virus
milium,
whitehead a small whitish lump in the skin due to a clogged sebaceous gland
Verb
defect -
desert (a cause, a country or an army), often in order to join the opposing cause, country, or army; "If soldiers deserted Hitler's army, they were shot"