Howdy y'all

So I got this guy a few weeks ago and all was well, but today I came home from work and he had this strange black coloring to the front of his head

https://i.imgur.com/HXui1WR.jpg

I've only raised one gecko prior to this and haven't seen this type of discoloration before. My best guess is he knocked his head into something going after a cricket. I've noticed he sees the crickets in the tank next to his and tends to look at them and lunge at them a bit.

But maybe nothing is wrong and he just got some interesting new coloration to his head.

Thanks in advance.