build your snake a humidity cup.

Fill a gladware tub with moist spangum moss(wet it down and wring it out!) and cut a hole in the top so your snake can fit in. Set on top of the UTH and VOILA! instant humidity cup!

The dent will come out with the next shed But when you do see him go blue, soak him once a day for about 10 minutes till he goes clear. That will help the shed go better (my reptile vet Dr. Stahl recommended that)