You can use a diluted Betadine or chlorhexidine (Hibiclens) solution to clean the spot once or twice a day. Keep the area free from debris (substrate, food, droppings, etc.). It should heal on its own within a week or so. Monitor for lethargy, loss of appetite, redness or discharge. If it doesn't show signs of healing within a few days, consider an exam with your veterinarian or a vet experienced in treating reptiles.