A 58-year-old man with type 2 diabetes mellitus (HbA1c 9.2%) undergoes elective open cholecystectomy for symptomatic cholelithiasis. On postoperative day 5, the wound shows erythema, induration, and purulent drainage. Culture grows Staphylococcus aureus. The patient is afebrile with stable vitals. What is the most appropriate immediate next step in management?

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