MEDICAL ANIMATION TRANSCRIPT: Pressure sores, also called bed sores, or decubitis ulcers, are regions of skin that break down when you sit or lie in one position for too long. These wounds occur most frequently in areas where your bones are close to the skin. Including your heels, ankles, hips, tailbone, or elbows. Constant pressure to one of these areas compresses the blood vessels that supply your skin with oxygen and vital nutrients. Without a sufficient amount of blood flow your skin cells eventually die. And a pressure sore forms. Pressure sores are categorized by degrees of severity. A stage one pressure sore is reddened, inflamed, and is not blanch, or become pale, when pressure is applied. A stage two pressure sore appears as a blister or an open sore. The area surrounding the sore may be red and irritated. A stage three pressure sore involves a full thickness loss of skin that appears crater like and extends to the layer of fat beneath your skin. Stage four is the most severe. A stage four ulcer is a full-thickness wound that extends down to the underlying muscle or bone. In 2007 the National Pressure Ulcer Advisory Panel added two more ulcer stages. Suspected deep tissue injury, and unstageable. Suspected deep tissue injury is a maroon or purple area of the skin and may contain a blister filled with blood. It looks like this because of damaged soft tissue underneath your skin. An unstageable ulcer is a full-thickness loss of tissue. However, the amount of tissue loss cannot be determined because the ulcer is covered by dead tissue. To prevent infection in your pressure sore your doctor will clean your wound using water and a mild soap or saline solution. If your would is severe your doctor will debride, or surgically remove, the dead tissue from the pressure sore. To protect and hydrate your wound your doctor may cover it with a specialized bandage.