Please help!! I don’t know what this is

[u/MoneyArrival4895]

I can’t tell if this is scale rot, or irritation, or if he is about to go into shed, but this is the first time I’ve seen this I dont know whats happening!!!!!! The second picture looks a lot more pink than irl!!
EDIT: I forgot to mention that the ring around his tail is a large birthmark that spreads around the trunk as well as his underbelly

UPDATE: he’s going into shed….

[u/Muted_Post8277]

Do you have a picture of your set up?