Is it covering the book lungs or is it on top of the abdomen? If it's on top, I wouldn't worry about it at all. It will either fall off over time, or it will just be gone the next time the t molts. If you're that worried about it, you can try dripping some water on it and it may come off on it's own or you can try to gently remove it. Unless it's interfering with something, I wouldn't worry the slightest about it from how you described it.