Acute febrile neutrophilic dermatosis (Sweet's syndrome).

We describe a patient who displayed the classic features of acute febrile neutrophilic dermatosis (Sweet's syndrome): sudden onset of erythematous plaques, fever, arthritis, and characteristic histologic findings. Unusual findings in her case were the localization of the lesions mainly on the legs, absence of leukocytosis and preceding illness, and marked neutrophilic infiltration in the subcutis. In addition, the fever and eruption subsided on the day the results of pathologic examination were available, making any treatment unnecessary. The short course of the disease in this patient suggests the possibility of postponing steroid treatment for one week in all patients with acute febrile neutrophilic dermatosis.