Acute febrile neutrophilic dermatosis (Sweet's syndrome). Association with rheumatoid vasculitis.

A 58-year-old woman suffering from rheumatoid arthritis complicated by a leukocytoclastic vasculitis had an acute febrile neutrophilic dermatosis (Sweet's syndrome) develop immediately after worsening of her arthritic condition. This association supports the hypothesis that immunologic abnormality is involved in the pathogenesis of Sweet's syndrome and raises the question of a possible common pathogenic pathway between neutrophilic dermatoses and leukocytoclastic vasculitis.