Hog island boas are especially 'fond' of rubbing. In fact, my hoggie rubbed her nose raw, and she has no nostrils anymore (scar tissue covered them)

I kept moving her to new enclosures to try to find something she couldn't hurt her nose on (from a screen lid to a plastic lidded rubbermaid).. but she kept rubbing. My vet told me that they keep rubbing and pushing on the lid if they feel any 'give' to it, so I moved her to a boaphile cage which is solid on top, and she has never rubbed again.