The Collaborative International Dictionary of English v.0.48:
zit \zit\ (z[i^]t), n. a pimple. [slang] [PJC]WordNet (r) 3.0 (2006):
zit n 1: a small inflamed elevation of the skin; a pustule or papule; common symptom in acne [syn: pimple, hickey, zit]