We report a case of typical erythema gyratum repens lesions observed as a manifestation of idiopathic hypereosinophilic syndrome in a 63-year-old man. While erythema gyratum repens is usually associated with malignancy, an intensive search over a 30-month period failed to reveal any evidence of neoplasm. With administration of dapsone, the typical gyrate lesions disappeared as the subject's hypereosinophilia improved.