It's just a little piece of skin that connects the spectacle (eye cap) to the rest of the skin. It gets displaced really easy, and doesn't hurt the snake at all, so just don't mess with it and it will be fine. Should go back to normal by the next shed. It does look like the eyecap may be a little dented though, which is usually a humidity issue. You may solve both problems by making sure you have the humidity right.