How's he doing? What did the vet do? But didn't he have multiple layers stuck on?
I'd probably not run to the vet with the OP's snake just yet, but boost the humidity & hope the all comes off in the next shed. It's just one layer so far. Actually I cannot
remember leaving stuck shed on a snake though...I'm persistent with helping (humid hide, raise humidity, soak, damp cloth, whatever it takes...).