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Stevens-Johnson's syndrome is a little frequenl"pathology, with a worldwide incidence average of 1,2 - 6 cases by 1 000000 inhabitants, like idiosyncratic reaction to the ingestion of determined food, infections or medicines. We are presenting a 46 years old male patient who goes by clinical picture characterized by the appearance of papuloerythematic, vesicular and pustules injuries in lips, oral cavity, extremities and glande; followed by fever, periorbitary edema, purulent conjuntivitis and conjuntival hemorrhage; the picture is developed 24 hours after. the ingestion of Alopurinol, prescribed by gout picture of first right toe. No other antecedent of importance. Dermatology and ophtalmology confirm the extension of the injury in the patient of 10 %, and the presence of bilateral symblepharon. Diagnosis of Stevens-Johnson's syndrome is made to him.