A physical therapist is completing an initial examination with a 21-year-old patient who had an ASIA A C6 spinal cord injury 2 weeks ago. Upon inspection of the patient's skin, the therapist noted that there was an area on the patient's right ischial tuberosity that was purple, soft to touch, non-blanchable, and slightly warmer than the surrounding tissue. Which of the following MOST accurately describes the area?
A. Stage 1 pressure ulcer
B. Stage 2 pressure ulcer
C. Stage 3 pressure ulcer
D. Suspected deep tissue injury