BLUE TONGUE SKINKS

Hey!
I noticed some dark marks around my BTS mouth and near his eye. After shedding, they were gone but now they're back. I hope somebody has an idea what it is or if I should go to the vet.
He never had a problem with shedding or anything like that. His scales also look healthy besides that, so I don't know what the problem could be.
Here's an image: https://fs1.directupload.net/images/181225/giadvyvz.jpg

Looks like dirt buildup glued on by the saliva. Some BTS get all kinds of gunk stuck to the mouth. Usually a rag dipped in warm water will loosen and remove that buildup temporarily. You'll probably have to keep doing it as it tends to be a re occurring issue with some.

Alright, thank you so much for answering. I was worried there for a second.