Since the infection returned after surgery, you likely need prescription oral antifungal medication, such as Terbinafine or Itraconazole, typically taken for 12 weeks. Because these require a liver function blood test first, you must see a doctor. To treat and prevent future recurrences: 1. Keep feet clean and completely dry. 2. Apply daily over-the-counter antifungal powder or spray inside your shoes. 3. Wear moisture-wicking socks and breathable shoes. 4. Avoid walking barefoot in public pools or locker rooms. Please consult a podiatrist or your doctor for a tailored treatment plan.