Eosinophilic panniculitis.

A 39-year-old obese female patient with borderline diabetes mellitus who developed multiple, tender, and hard nodules on the lower abdominal wall is described. The histological features were characterized by mixed panniculitis, showing massive eosinophilic infiltration and fibrosis in the septae and many foam cells in the parenchymal area of subcutaneous tissues. The eruption regressed gradually during the course of diet therapy for diabetes mellitus and obesity. Although the etiology is diverse and nonspecific, eosinophilic panniculitis seems to be a unique histopathological reaction pattern characterized by massive eosinophilic infiltration into subcutaneous tissues.