Impetigo herpetiformis (IH) is a very rare and specific pustular dermatosis of pregnancy that can be life-threatening for both mother and child. This entity is currently considered as a variant of pustular psoriasis. We report an observation of a 35-year-old female patient who presented with extensive erythematous-pustular plaques for which the diagnosis of impetigo herpetiformiswas made clinically and histologically. The lesions appeared in the third trimester of pregnancy without fetal or maternal impact. The treatment was prednisone, vitamin D supplementation and a macrolide for 10 days.