Q. A 73-year-old male presents to your clinic for evaluation of a “sore” on his left foot. He reports the injury occurred four months ago, and believes it started as a “bug bite”. He is here today because the wound has failed to heal. He has no history of similar symptoms, and denies any fevers, or other rashes or lesions. The patient’s past medical history is significant for diabetes and hypercholesterolemia. His most recent hemoglobin A1c (HbA1c) six months ago was 6.5 percent. He smokes 1 pack of cigarettes per day, and does not drink alcohol. He has no history of recent travel, and no known sick contacts. On physical examination, his blood pressure is 130/90 mm Hg, heart rate 65/min, and respiratory rate 18/min. Chest auscultation reveals clear lung fields bilaterally, and cardiac examination is normal. A 2.5 cm (1 inch) ulceration is noted on the dorsal aspect of the patient’s left foot (see photo). There is no associated edema, induration, or drainage. What is the next best step in the management of this patient?