Since you can't actually see the wound, I would get a roll of gauze. After treating with the antibiotic ointment, roll the gauze around the top and bottom of your foot several times and secure with medical tape. Just to be safe, I'd use it to cover from the bottom of the toes through the arch - that way you're sure to have the affected area covered. If it continues to hurt, you really will need to see the doctor. Hope this helps!