Eosinophilic cellulitis (Wells' syndrome).

Two patients with eosinophilic cellulitis are reported and 22 additional cases from the literature are reviewed. Cutaneous lesions are variable in appearance and may be confused with cellulitis, urticaria, insect bites, or contact dermatitis. Microscopically, there is a dense dermal infiltrate of eosinophils. Subsequently, granulomatous features with characteristic "flame figures" become apparent. Peripheral eosinophilia is common. The etiology of eosinophilic cellulitis is unknown, although a hypersensitivity mechanism is suspected. Treatment with systemic corticosteroids is frequently effective, but the disease is often characterized by relapses that can occur for several years.