weird brown scales on bp head

hello, ive had my ball for two weeks now and while trying to get the humidity in his enclosure to be high enough for him to shed i accidentally kept his substrate damp for about a day.
i fixed the issue as quickly as i could, and he's shed the day after, but he seems to have developed scale rot on just one scale on his belly, and it hasnt changed the past few days.

other than that, he also has developed these on his head, which is concerning me. its not a marking, but i cant tell what it is. im thinking it could be scale rot, but its... a strange place for scale rot.
any idea on what it could be?
this is the weird scales on his head:
https://media.discordapp.net/attachm...3044a1a40be66&

this is the other side of his head:
https://media.discordapp.net/attachm...d634e5073545d&

this is the one scale on his belly: https://media.discordapp.net/attachm...37a9415704350&

he is active, he eats and poops just fine and his shed was good too.

What kind of substrate is he on? I don't think it's scale rot at all.
Just looks like a bit of rub on the side of the head which can be from shedding or from exploring the new enclosure.
The belly just looks like a bit of shed stuck under the belly scale, possibly with some discolor from the bedding.

I'd just try and enjoy him from a distance for a bit and let him keep settling in.

he is on hemp bedding, because the humidity in my house is naturally around 60-70% and his enclosure is usually at 55% with no misting. i was planning on switching it to coco husk or mulch depending on which i can find for cheaper... just because i dont want the substrate to get soaked again. he does also have a humidity box with moss inside.

you might be right about the rub, i didnt consider it.. he shed right behind the humidity box between the pvc walls which is a really tight spot