Today, I took out my two year old ball python to clean his enclosure and there is what looks like missing scales or even a hole in his skin. It has me worried and I thought I would look for advice here before finding a vet on the weekend.

When I first bought him at 3 months old, he had stuck shed all over from what I assumed were improper conditions. Ever since, he's had a discoloration on top of his head where shed had been stuck. Since he has been in my care, he has shed perfectly every time. He eats regularly and seems healthy. A couple of weeks ago, he shed in all one piece but one small piece on his head was still stuck on (same spot where the shed had been stuck years ago). The humidity and temps were fine and everything else looked alright so I assumed it would come off eventually or with the next shed. Two days ago, that piece of shed was still there. Today, I saw this:

https://imgur.com/a/iigIfpD

The stuck shed is gone but there is this hole on his head. I'm not sure if he got the shed caught on something and then it got pulled off along with some of his skin? Is this something serious or is it a small problem that will heal with next shed?

Advice is greatly appreciated.