It actually looks like 2 different issues to me...the top photos, minor bruising (& only showing up because it's white), while the bottom photos could be a fungal
issue with those scales, but sure can't diagnose it this way: it's just the way the individual scales are affected -it's near-impossible to get a bruise on ONE scale.
Good question for your vet...especially since if it's a fungal infection on the scales, you'll be seeing more of those spots, even after next shed...up close the scales
look sort of shriveled. A topical medication can turn this around pretty easily with regular attention, & it won't go away on it's own (if I'm correct?).
If your snake had mites, you'd be finding tiny red/brown/black moving specks (pin point size) on your snake, in the water dish & in the cage. Mites do not cause
markings like you're showing us.
Does not appear to be burns either...it's hard for a snake to get tiny burns like that, just like with bruises, burns tend to be bigger (& usually ventral).