Help what is this rash looking like redness on her spine?

[KMG]

I’m pretty sure I got her perfectly healthy I got her in March and scale rot appeared around mid April I’m pretty sure I was misting the terrarium to much

I wouldn't think misting would cause that. Not being there I'm at a major disadvantage not being able to really investigate.

Could it be a rub like suggested? Does it have something it can crawl under or through?