This is necrosis of soft tissue caused by obstructed circulation
[DOC] [TLE] Gangrene | definition of gangrene by Medical dictionary [PAR] As tissues begin to die, dry gangrene may cause some pain in the early ..... Moist 
gangrene may follow a crushing injury or an obstruction of blood flow by an .... n 
the necrosis accompanied by gas bubbles in soft tissue after trauma or surgery.