A pressure ulcer (or pressure sore) is an area of skin that breaks down when you stay in one position for too long without shifting your weight. This often happens if you use a wheelchair or are bedridden. A pressure sore can appear even after a short period of time, such as after surgery or an injury. The constant pressure against the skin reduces the blood supply to that area, and the affected tissue dies. Millions of people suffer from pressure sores each year.
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