Close up pics would certainly help. I would suggest a vet visit, or at the very least, get his stool sample to a herp-experienced vet to check for parasites. If he has internal parasites sharing his intake of water & nutrition, that could explain his difficulty to properly shed. Growth requires nutrition & proper hydration...parasites steal both. There may be other medical issues causing this but that's beyond what we can tell on the internet, & it's MOST likely caused by internal or external parasites. I assume ? you've checked closely for mites (use magnification!) & that this snake has NO mites? They could also cause this scenario.
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