Phase limb gangrene artery occlusion distal limb necrosis, skin dishes, or black or brown gradually expand upward, can happen to ours unhealed ulcer.

• 患肢动脉完全闭塞，肢体远端发生坏死，皮肤呈暗红，或黑褐色，逐渐向上扩展，可发生经久不愈的溃疡。