Dry gangrene is a type of tissue death that occurs when blood flow to a specific area is reduced or blocked, often due to conditions like diabetes or atherosclerosis. This lack of blood supply leads to the gradual drying out and darkening of the affected tissue, which can eventually become black and shriveled. Unlike wet gangrene, which is associated with infection and swelling, dry gangrene typically develops slowly and is less likely to spread. Treatment often involves improving blood circulation, and in severe cases, surgical removal of the dead tissue may be necessary to prevent complications.