He needs help. that shed is not going to come off on its own. You need to soak him and help as much as possible getting that shed off.
Try tossing him in a wet pillow case tied off for one hour. Put the case back in the cage on warm end and let him slither around. Keep doing this until the shed comes off daily.
This is EXACTLY what you need to do. There is a sticky I believe on soaking too. He def needs a soak, or a damp pillow case. His shed is stuck and he's uncomfortable. He will look and feel much better once that miserable old coat is off.
Good Luck
Chocolate Muffin (f- normal) - 4 1/2 years old Nico N. Wilson(f - normal) - 20 years old