Zit
来自Big Physics
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1960s: of unknown origin; apparently originally teenagers' slang in North American English.
wiktionary
Uncertain origin, first attested as 1960s North American English slang. Compare English chit(“pimple, wart”), German Zitze(“teat, nipple”).
etymonline
zit (n.)
"acne pimple," 1966, originally U.S. teenager slang, of unknown origin.