Impetigo herpetiformis is a rare pustular disorder that primarily affects pregnant women. A 31 year-old woman at 37 weeks and 4 days' gestation of 3rd pregnancy presented with pruritic multiple erythematous pustules and crusts on the trunk and both antecubital fossa for 3 months. She had had similar lesions in her 1st and 2nd pregnancy, which subsided after delivery without any fetal or maternal complication. She had no personal or familial history of psoriasis. Histopathologic findings showed subcorneal pustules with numerous neutrophils and spongiform pustule of Kogoj. Bacterial culture from pustules was sterile. After Caesarean section at 38 weeks' gestation, a healthy female neonate was delivered and her skin lesion resolved spontaneously.