Several thoughts...
First, as has been mentioned, that looks like septicemia. It could possibly be contact dermatitis related to something in the pedialyte. I think this is less likely, but I would still stop soaking him in pedialyte, just in case.
When you are soaking him, do you check the water temperature of the soak? Remember that we are 98.6 degrees, so what feels like a nice warm bath to us is often too hot for a snake. The soak should be around 80-85 degrees. I don't think it is hot water burns, but that isn't completely out of the realm of possibility.
I would go ahead and offer a meal. He really needs nutrition. Hopefully he will take it.
If it were me, I would stop soaking in pedialyte; would soak him in dilute Betadine (at 80-85 degrees for the soak) solution treated with dechlorinator for 15 min, then soak in plain water at same temp treated with dechlorinator for 15 - 30 min (making sure water temp doesn't drop too low); would give him an injection of Vit B complex; would start him on antibiotics; and would do a complete wash and sanitization of his enclosure.
Since you likely can't do all of that yourself - vet, vet, vet (just reinforcing what it sounds like you have already decided on).
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