The condition usually begins as a swelling on the skin. Then large ulcers form. These breaks destroy skin and soft tissue, sometimes all the way down to the bone.

• 症状通常是在皮肤上先出现一块浮肿。然后形成大面积的溃疡。这些溃疡破坏皮肤和软组织，有时伤至骨骼。