Twelve-year-old boy with vesicle over lip. Investigation to be done is:: (A) KOH mount, (B) Tzank smear, (C) Diascopy, (D) Woods lamp
Answer is B. Ans. b. Tzanck smearHerpes labialis occurs due to HSV-I injection on Tzanck smear shows, multinucleated giant cells (MNGC).