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Pressure Injuries: Stages

Topic Overview

Pressure injuries are described in four stages.

  • Stage 1 sores are not open wounds. The skin may be painful, but it has no breaks or tears. The skin appears reddened and does not blanch (lose color briefly when you press your finger on it then remove your finger). In a dark-skinned person, the area may appear to be a different color than the surrounding skin, but it may not look red. Skin temperature is often warmer. And the stage 1 sore can feel either firmer or softer than the area around it.
  • At stage 2, the skin usually breaks open, wears away, or forms an ulcer, which is usually tender and painful. The sore expands into deeper layers of the skin. It can look like a scrape (abrasion) or a shallow crater in the skin. Sometimes this stage looks like a blister filled with clear fluid. At this stage, some skin may be damaged beyond repair or may die.
  • During stage 3, the sore gets worse and extends into the tissue beneath the skin, forming a small crater. Fat may show in the sore, but not muscle, tendon, or bone.
  • At stage 4, the pressure injury is very deep, reaching into muscle and bone and causing extensive damage. Damage to deeper tissues, tendons, and joints may occur.

In stages 3 and 4 there may be little or no pain due to significant tissue damage. Serious complications, such as infection of the bone (osteomyelitis) or blood (sepsis), can occur if pressure injuries progress.

Sometimes a pressure injury does not fit into one of these stages.

  • In some cases, a deep pressure injury is suspected but can't be confirmed. When there isn't an open wound but the tissues beneath the surface have been damaged, the sore is called a deep tissue injury (DTI). The area of skin may look purple or dark red, or there may be a blood-filled blister. If you or your doctor suspects a pressure injury, the area is treated as though a pressure injury has formed.
  • There are also pressure injuries that are "unstageable." This means that the stage is not clear. In these cases, the base of the sore is covered by a thick layer of other tissue and pus that may be yellow, gray, green, brown, or black. The doctor cannot see the base of the sore to determine the stage.

This information does not replace the advice of a doctor. Healthwise, Incorporated, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Learn how we develop our content.

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