I would suggest that you only use Neosporin very sparingly & only for emergency* use, until you get your hands on some Vetericyn ointment intended for use on snakes/reptiles. While a little Neosporin is technically "safe" to use, keep in mind that it's petroleum-base can really mess up your snake's sheds for many sheds to come if you use too much. Vetericyn, on the other hand, is a water based antiseptic FOR reptiles- & you can find it sold in some pet stores or on line. Note: Vetericyn is the "brand" name- they make products for many kinds of other animals so read carefully what you're buying or ordering, that it's for snake-use. (*while scale rot is a concern, it's not an emergency- I'd wipe off the Neosporin as much as you can, & get the right stuff to use; the Betadine -diluted- is fine to use as you did.)