According to NHS Improvement a pressure ulcer is localised damage to the skin and/or underlying tissue, usually over a bony prominence (or related to a medical or other device), which results from sustained pressure. The damage can present as intact skin or an open ulcer and may be painful.
Nursing Older People. 32, 1, 10-10. doi: 10.7748/nop.32.1.10.s8
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