My little BP has a patch of scraped scales on his head and the side of his neck. He has had it for a while now, sometimes less sometimes more. I assume that it comes from him squeezing his head in the gaps of my heating element cage.

I have a mesh protecter over my heating element. I have tried to keep the gaps as small as possible to the walls of the enclosure. On three sides it's small enough that he can only put his snout in slightly but the fourth side there are two gaps where he fits his head through. It's a quadratic mesh cage.
I have tried safe proving it already by putting foam sheets into the gap and it has helped to reduce the amounts of time he tries to squeeze in there. But there are still these two spots where I can't put the foam in. Otherwise my doors won't open up.
And I don't want to change the whole setup since it's been working perfectly heat wise and so on. and I don't really have any other options for my heating element.

Here are pics, it's not that deep, there is no blood. It looks like only the scales have been scraped. I have put undeluted betatine on the patches on his head and didn't wash it off. I hope that wasn't wrong.
Sry I know quality is crap but it's with my phone and he wouldn't sit still.
https://www.instagram.com/p/CW2hchos...dium=copy_link

Pic of problematic area:
https://www.instagram.com/p/CW2kCBDM...dium=copy_link

Secondly I want to ask about his vent. His anal spurs have a reddish color at the base where they come out. I never noticed this before. Is it normal?
And under his vent scale it looks reddish too (pics above) . The vent scale also seems to be lifting very slightly off the body so that I can see a bit under it. When he was younger I never noticed this so I am asking is this normal?
Thanks.