Gangrene is a type of necrosis caused by a critically insufficient blood supply.
Symptoms
Dry and shriveled skin that changes color from blue to black and eventually sloughs off
Cold and numb skin
Pain may or may not be present
The method of treatment is generally determined by the location of affected tissue and extent of tissue loss. The best treatment for gangrene is revascularization of the afflicted organ, which can reverse some of the effects of necrosis and allow healing. Other treatments include antibiotic therapy, wound care, debridement and surgical amputation.