When I first got my beak snake she had a terrible case of mites. You could actually see in around her eye. After I got rid of them she had something very similar to this for a few months. She shed twice before it came off, and both times her eye cap came off fine, but there was a thick ring around the eye in the shed and it was still there. Finally after her last shed it flaked off no problem. I just kept her humidity up. So I would say wait it out for a while and see if it resolves itself in a couple sheds :)