Stage I: The skin is intact with the presence of non-blanchable erythema
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Stage II: There is partial-thickness skin loss involving the epidermis and dermis
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Stage III: There is a full-thickness loss of skin that extends to the subcutaneous tissue but does not cross the fascia beneath it
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Stage IV: There is full-thickness skin loss extending through the fascia with considerable tissue loss. There might be possible involvement of the muscle, bone, tendon, or joint
