Chronic pruritic dermatitis and peripheral eosinophilia in a 42-year-old man

Chronic pruritic dermatitis with or without accompanying peripheral eosinophilia can be caused by a vast array of underlying disorders broadly classified as allergic/immunologic, infectious, or neoplastic. An organized and thorough work up is crucial in order to arrive at a definitive diagnosis enabling appropriate treatment. We present the case of a 42-year-old man with a history of chronic pruritic dermatitis and peripheral eosinophilia in a patient-oriented, problem-solving format including the clinical presentation, physical findings, results of pertinent lab/radiologic studies, differential diagnosis, and final diagnosis with discussion.