本病病因目前尚未明了。一般认为可能是溴化物、碘化物或感染病灶诱发的一种变态反应性疾病。临床表现为反复发作的皮下脂肪层的炎性结节或片块。损害成批出现,大小不一,边缘清楚,结节可与皮肤粘连而表面略呈红色。少数中心可坏死溃破,流出脂状物质,但不化脓。皮损好发于四肢 The cause of the disease is not yet clear. It is generally considered as an allergic disease induced by bromide, iodide, or an infectious lesion. Clinical manifestations of recurrent subcutaneous fat layer of inflammatory nodules or pieces. Damage occurs in batches, sizes, edges clear, nodules can be attached to the skin and the surface is slightly red. A small number of centers can be necrotic ulcerated, out of fatty substances, but not purulent. Skin lesions occur in the limbs