White spot?

Hey everyone!

My four-year-old Fire spider ball python just shed, and right away I noticed that his head looked quite a bit whiter. This is my first ball python, So I’m not an expert by any means. Is this normal for them to change when they were already four years old? What else could this white patch be? Thank you. Picture linked below.

https://m.imgur.com/xIbvTqd

Could be a slight head-rub. Is there anything abrasive that he's rubbing or pushing his head on? What kind of enclosure is he in?

Possibly not enough humidity? I’d definitely double check that route too!

Thanks guys. He is in a tub enclosure, his humidity is fine so I guess maybe it was a head rub somewhere. Is there any chance it could be natural?