The lesion relapsed despite radiotherapy, interferon injection and excision part by part for many times.Finally, the lesion was eradicated by cyclo-excision layer by layer.

• 曾放疗、肌注干扰素，多次分区分片清除皮损，皮损仍反复复发，后改用逐层向内环行切除皮损的方法治愈。