Stage one is the beginning of a bedsore. The skin is not broken but appears to be red on people with light skin and discolored on people with darker skin tones. The area may be tender and painful. Color changes do not include purple or maroon discoloration; these may indicate deep tissue pressure injury.
When a bedsore reaches stage two, the outer layer of the skin and a portion of the underlying skin has been damaged. The bedsore may look l like a ruptured blister or fluid-filled blister that is red or pinkish.
By the time the bedsore reaches stage three, it is a deep ulcer or wound. The loss of skin exposes some fat, and the bedsore appears to be crater-like. The bottom of the bedsore may have yellowish dead tissue, and the damage can extend outward from the primary wound underneath layers of healthy skin.
When the bedsore reaches stage four, you see large-scale loss of tissue. The wound may expose bone, tendons, or muscle and the bottom of the wound appears dark, crusty, or yellowish because of the dead skin. At this stage, the damage almost always extends beyond the primary wound.
- If the surface of the bedsore is covered with dead tissues (yellow, brown, or black), it is considered unstageable because you cannot see how deep the wound is to place it in one of the four stages for bedsores.