| Sumario: | We present a rare case of Sweet's syndrome. A 39-year-old woman with subjective fevers, polyarthralgia, and malaise presented with worsening painful erythematous plaques on the trunk, arms, and legs. Further examination with biopsy revealed a diagnosis of acute febrile neutrophilic dermatosis, or Sweet's syndrome. Diagnosis by skin biopsy is crucial, and onset requires prompt evaluation for serious associated disorders such as leukemias, inflammatory bowel disease, thyroid disease, sarcoidosis, and infectious etiologies. In general, symptoms and cutaneous manifestations of Sweet syndrome respond rapidly to treatment with systemic corticosteroids or potassium iodide.
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