Tjos 30-year-old man with a history of acute contact poison ivy dermatitis developed a widespread bright red eruption with confluence in the groin, buttocks, thighs, palms, soles, and intertriginous areas. Although he had a low grade fever, he was otherwise well, and the lesions resolved with a 10 day course of oral steroids. A biopsy showed an acute dermatitis. Baboon syndrome is a systemic reaction following a severe acute contact dermatitis or a drug reaction. The eruption is characterized by intensely pruritic confluent red papules in the groin, thighs, and buttocks and at least one other intertriginous area resembling the red gluteal areas of baboons. Although half of the reactions are related to oral medication exposure, an acute contact dermatitis is the trigger in 10-15 percent of cases.
symmetric discrete and confluent red partially blanching macules and patches