I found this:
on my snakes head, if you can see it. The picture makes it look like pus or something but when I look it looks like dirt or something. Maybe the new substrate? I did get one tiny splinter when I was unpacking it, but that is a lot harder than just going around on the surface. And if it was burrowing it would be on the tip of it's nose. The snake, however, is acting like normal though. You can look at what it's head looked like a month or two ago in the photo contest for reference.