Anticonvulsant hypersensitivity syndrome is a life threatening immunologic reaction of anticonvulsants therapy such as phenytoin, phenobarbital, or carbamazepine, characterized by multiple abnormalities ssuch as fever, rash, lymphadenopathy, acute hepatocellular injury, leukocytosis, and eosinophilia. We report a case of anticonvulsant hypersensitivity syndrome thought to be caused by the use of carbamazepine in a 65-year-old male. He developed erythematous skin eruption four weeks after beginning therapy with carbamazepine. The clinical, laboratory and histologic findings of this patient were compatible with anticonvulsant hypersensitivity syndrome.