Betadine solution. You want it diluted until its tea colored. If its just a small area, a bath isn't needed. Just take a cotton ball and swab the area once or twice a day.
Neosporin is bad for the scales if used too often. But I suggest once every other day for the first week. Apply after the betadine swab. Then apply only once or twice a week after the first week for 2 weeks. It should be good enough then that it can heal on its own."