Suspected deep pressure-induced tissue damage, depth unknown

**Definition:** An area of soft tissue damage due to pressure or shear which is anticipated to evolve into a deep pressure ulcer but has not yet done so. The affected skin is typically discoloured purple or maroon and may display haemorrhagic blistering. It may be painful and oedematous. It can be either warmer or cooler than adjacent tissue. Evolution into a deep ulcer may be rapid even with optimal treatment.