Patients receive at least 10 days (and up to 42 days) of treatment with topical trifluridine. Trifluridine is applied in a thin fluid layer that overlaps the edges of the lesion. Polymyxin B sulfate/bacitracin zinc ointment is then applied over the trifluridine. Lesions are covered by a nonabsorbent dressing. Medication is applied every 8 hours.