Final answer:
A characteristic feature of a Stage 3 pressure injury is full-thickness skin loss.
Step-by-step explanation:
A characteristic feature of a Stage 3 pressure injury is full-thickness skin loss. Pressure injuries, also known as bedsores or decubitis ulcers, occur when there is constant, long-term, unrelieved pressure on certain body parts, reducing blood flow and causing tissue death. Stage 3 pressure injuries involve the loss of the outermost layer of skin (epidermis) and damage to the underlying tissue (dermis).