A young boy presented with a lesion over his right buttock, which had peripheral scaling with central scarring. The investigation of choice would be?: (A) Tzanck smear, (B) KOH preparation, (C) Biopsy, (D) Sabourad's agar
Answer is C. Central clearing: T. Corporis - KOH smear Central scarring: Lupus vulgaris - Biopsy Central crusting: Leishmaniasis - LT body demonstration