Need help with topic for a Teaching Plan

Hey everyone I have a problem, Im not sure if you guys have to do teaching plans, but at my school its required for clinicals. It's pretty self-explanatory, just something to teach the patient, but we have to demonstrate it in front of the class. My problem is, thinking of a subject to teach. Previous topics are DVT, UTI, wounds" I picked Tissue perfusion but the professor says it cant be a diagnosis. Any topic suggestions will be helpful. Thanks!