Review Question - QID 210892

A 57-year-old man presents to his primary care physician for a foot wound. He noticed that it has been slowly developing over time and his wife finally encouraged him to come in. The patient was recently hiking in the wilderness on a camping expedition. He has a medical history of hypertension, diabetes, and depression. He is currently taking insulin, metformin, and lisinopril. His temperature is 98.7°F (37°C), blood pressure is 141/89 mmHg, pulse is 84/min, respirations are 12/min, and oxygen saturation is 99% on room air. Physical exam is notable for the finding in Figure A. Radiography of the foot is obtained and demonstrates no acute bony changes or edema. Which of the following is the most appropriate next step in management?