There has been so many good points made, I think many people just want what’s best for the whole situation. I’m in agreement with a possible overheat. But knowing how he is kept and the chances he could of easily came across something else harmful is hard to ignore. I keep all my snakes in tanks in my living room, at first I thought he was being a typical horny male. But after reading this and other previous posts, I’d recommend a vet trip. And definitely more conventional snake husbandry. Peace, hope it all works out.