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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.
Ulcer is a catch-all term for any hole in a bodily membrane. In the case of canker sores, the top layer of epithelial cells gets worn away, exposing the blood vessels and sensitive nerves underneath. Think of it like a blister with its outer dome dissolved.