Excessive Rubbing/Pushing, not in Shed

Hey all, Lemon has been rubbing/pushing his nose across the edge of his tub repetitively for a while now. He's shed recently and kept at it. His temps/humidity are good, and none of my other BPs are exhibiting this behavior. He's also eating regularly, no problems. I'm concerned that he'll hurt himself and today I caught him very determinedly trying to shove his face sideways through the tiny gap between the tub and the shelf. I've tried taking him out of the tub and letting him roam for a bit before putting him back. I've done full substrate changes, I've tried moving his house to different parts of the tub. Nothing really seems to make him stop. Its been a few weeks and his nose is starting to get a rubbed looking spot on it. Is there anything that might be causing this? Could he permanently disfigure his face with all the rubbing? I tried to get a picture, but he's a wiggly one so this is the best I could manage.

https://38.media.tumblr.com/8eb3959b...gpzjo1_500.jpg

Try making him feel more comfortable, Hes doing this out of stress. Try blacking out the sides, offering some plastic leafs as a more security.

It's just the way it is, you've got a snake in a tub. The only way to stop the rubbing is to put your snake in an an enclosure so large that it has no desire to get out. I have a hatchling in a 180 gallon enclosure, he doesn't rub... but thats obviously not going to be workable for everyone!