Final answer:
Massaging the reddened area can further damage the already compromised tissue, worsening the ulcer.
Step-by-step explanation:
The action by the health care team that could cause the tissue of the patient's pressure ulcer to become more damaged is b. Massaging the reddened area.
Pressure ulcers, also known as bedsores or decubitus ulcers, occur when there is constant, long-term, unrelieved pressure on certain body parts, reducing blood flow to the area and leading to tissue death. Massaging the reddened area can further damage the already compromised tissue, worsening the ulcer.