I rarely have bad sheds but recently my little pastel lesser had a pretty bad shed similar to yours just mine had his head skin off. I knew he was shedding and had his humidity up but he's really young is just a little dumb he's uh still figuring it out. But anyway what i did was put this softball sized rock with a ruff surface in his tub a night then cranked up his humidity. In the morning he had used it to get most of it off. I just had to assist and help peel the rest off. If you use a rock make sure its clean a safe shaped rock you know something that cant fall on him or hurt him.
We have a natural wood log in there and his water bowl has roughish exterior as well. I have some sandstone out in the back ward I could boil in water to clean. Would that be ok to use??