Grade 1 | Non-blanching erythema of intact skin. Discoloration of the skin, warmth, oedema, induration or hardness may also be used as indicators, particularly on individuals with darker skin |
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Grade 2 | Partial thickness skin loss involving the epidermis, dermis or both. The ulcer is superficial and presents clinically as an abrasion or blister |
Grade 3 | Full thickness skin loss involving damage to or necrosis of subcutaneous tissue that may extend down to but not through the underlying fascia |
Grade 4 | Extensive destruction, tissue necrosis or damage to muscle, bone or supporting structures with or without full thickness skin loss |