Young snakes can shed every couple weeks sometimes, there's no exact schedule. And I hope you don't think we all remember the age of your snake? Please include that information if you want our best answers...we shouldn't have to search for the information.
If it's not a shed & the prey is properly prepared & offered, that leaves overfeeding...& again, you haven't given much info- we're not seeing him, nor his feeding schedule nor what you're feeding him (in terms of size). (Another possible issue is illness but that's the least likely issue.)