Just for future notice. You shouldn't keep neo or triple a or any of those type things on any herp. It's oil based and softens their scales, leaving them open for further injury. I'd leave it at the betadyine baths and let it heal. It could also be another bite and the rat just got the tip of the scale. I don't think you will have any further issues from it but I'd leave the neo off for good.
Hope this helps.
Morgan