I need some clear answers about thermal burns/belly rot

[schmup]

Hi, I'm a brand new member to this forum, and I registered because ball python, Lenny, is having a problem.

I have looked under thermal burns and belly rot, but I have had extreme difficulty in finding out what my ball python has going on because of all the different answers....maybe some of you BP experts could help me out?
Here's the situation....

SYMPTOMS:
Two days ago I noticed that his belly is flaky. Just his belly.
There are not any red spots, rusty marks, or anything like that.
Just flaky and sort of pearlescent and maybe a little wrinkled looking.
My boyfriend and I think that it MIGHT be a little pink...but it's so faint it might just be our imaginations.

I thought it might be a burn or dehydration, so I bathed him in warm water and toweled him off. Just a little bit of the flaking scale came off, not whole scales of course, just a little bit of the layer. I've been keeping the humidity at 50% and his temps (night-day) are 70-77 ambient and 85-93 in his hide box. His other log hiding area is just a little warmer than the ambient when I check it. I use two thermometers (one probe in the hide box, one mounted inside the tank) and a humidity sensor. I use aspen shavings for his bedding. His last shed was about a month ago.

I'm going to entirely Re-Do his tank setup this weekend, and so any tips on that are appreciated, but I MOSTLY just want to know if the flaking is a thermal burn or scale rot or something else.