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consensus conference and their comments were used to create the final definitions. Pressure Ulcer Definition. A pressure ulcer is localized injury to the skin and/or underlying tissue usually over a bony prominence, as. a result of pressure, or pressure in combination with shear.
Pressure ulcers can range from mild reddening of the skin to severe tissue damageâand sometimes infection â that extends into muscle and bone. As the pressure ulcer progresses, the skin will break down to form blisters and the skin will begin to die, ultimately infecting the underlying tissues, bones, and joints. These ulcers are described in four stages: 1  Stage 1 sores are not open wounds.