What is a pressure ulcer and how is it caused?
A pressure ulcer is an injury to the skin and the tissue below. It forms when the skin is pressed against a bone. It's caused by pressure, rubbing or friction. Pressure ulcers happen when a person sits or lies down for a long time without moving. They can cause pain and scarring. They might drain a little or a lot and can get in the way of daily living. A pressure ulcer can also cause a person to stay in the hospital.