Update on panniculitis.

There is considerable confusion regarding the pathogenesis, nosology and treatment of panniculitis. This paper examines newer concepts in five types of panniculitis: i.e., histiocytic cytophagic panniculitis, erythema induratum, lipodermatosclerosis, pancreatic panniculitis and alpha-1-antitrypsin deficiency panniculitis. Recent developments in etiology, pathogenesis, molecular techniques, and therapy are discussed.