Final answer:
A stage 3 pressure ulcer is a severe and deep wound that occurs when excessive pressure is applied to a specific area of the body, leading to tissue death. It extends into the deeper layers of the skin, reaching down to the muscle or bone. Signs of infection may be present.
Step-by-step explanation:
A stage 3 pressure ulcer is a severe and deep wound that occurs when excessive pressure is applied to a specific area of the body, leading to tissue death. At this stage, the ulcer extends into the deeper layers of the skin and can reach down to the muscle or bone. The wound may appear as a deep crater or a shallow open ulcer with a yellowish dead tissue at the center. It may also have signs of infection such as redness, swelling, and pus.