are you sure its scale rot? Either way neosporin is a great way to treat it. But its possible that i could also be thermal burns. It would be odd to have burns in such a small consintrated area but when my snake got burns from a unstable UTH it sounds a lot like what happening to you. She was read and then as i started treating her the affected scales began to dry up and then by next shed the area was healed. I also gave her a 15 minute soak in chlorohexidine to keep germs or chance of infection from occuring. And it also a great way to keep your tank clean with a simple mixture with water. Hope this helps!
To avoid this again:
Scale rot- make sure that your substrate is not holding to much moisture, specially in her hides where she spends the most time. Don't over mist the tank and keep your water dish away from hides so an accidental spill wont' be an issue.
Thermal burns- Make sure that if you heading using an UTH that you have it on a thermotstat, becore mine was it got up to almost 120 degrees which is really really dangerious for you snake. Other then that yor donig the right thing with the neosporin.