He's probably having trouble shedding because of humidity.. at this point its best to soak him. Just get a rubbermaid container and fill with lukewarm water and leave him in there for awile.. make sure he can breath and everything tho. Your humidity is probably too low to begin with.. but next time he sheds it might be wise to throw in a wet towel when hes about to shed which will give added humity for the shed and also give him something to help him shed with.
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"It's my snake, I trained it, so I'm going to eat it!" - Mad Max, The Road Warrior