Definition A particular type of systemic contact dermatitis characterised by symmetrical, sharply-demarcated erythematous patches on the buttocks and upper legs, which is strikingly similar to baboons’ butts. The lesions are often associated with a symmetrical eczematous rash involving the axillae, antecubital fossae, eyelids, and lateral neck.
Causative agents Various formulations of penicillin, radiocontrast media, and others
Mechanism Type IV cell mediated reaction.
The name obtains from the bright-red anogenital coloration of the baboon bum/bottom.
Synonyms Eczematous drug eruption (in part), flexural exanthema (in part), intertriginous drug eruption (in part), SDRIFE, symmetrical drug related intertriginous and flexural exanthema
References http://en.wikipedia.org/wiki/ Baboon_syndrome