My snake JUST did this, and it's weird as heck.
He turned pink, went opaqued, cleared up, shed IN MY HANDS, and now his whole belly is this kind of pale pink. I don't know what the deal is. The UTH is on a thermostat that's working. There's nothing damp in the cage. There are no mites. He's just *pink* - and I've seen him immediately after shed before and he definitely had a white belly then. He is definitely a he, so it's not ovulation. He's also eating super well.
So, I'm at a loss with you, and stalking this thread.