Localization of Sweet's syndrome in radiation-induced locus minoris resistentae.

Sweet's syndrome is a reactive dermatosis clinically characterized by fever, leukocytosis, and multiple, erythematous, painful plaques. Histopathologically, the lesions show edema of the papillary dermis and a dermal infiltrate mainly composed of neutrophils, without vasculitis. We describe a patient with breast carcinoma and Sweet's syndrome mostly involving previously irradiated skin.