Help! Medical/skin issue with Elaphe prasina!

[Charis]

I got this guy and 2 females, back at the end of April. The females took several weeks to settle in and start eating but the male has never eaten for me. I've been keeping an a eye on him, looking for any signs of a physical problem but hadn't seen much. He does like to soak a lot, which concerned me a bit but I never saw any signs of mites. However, he was getting water all over the enclosure and getting the substrate very wet, that was concerning me a bit, so last week I actually switched out his large water bowl for a much smaller one to cut down on that.

Where he was not eating and I was assuming that it was probably either just taking him an extra long time to acclimate and or a male seasonal fasting thing, I was also trying to leave him alone and quiet as much as possible.

Now though I'm afraid that I wasn't paying enough attention to him because between removing his big water bowl around a week ago and checking on him tonight, he has developed some very scary looking blisters, tumors, parasites or fungal infection, I'm not sure which. I'm somewhat leaning towards them maybe being because he was too consistently damp??
Anyway, there is a small one at the top of his body, near the spine, three very large ones close together on his side, another slightly smaller one above those three on his side and a large one on his lower jaw, towards the side. All except the one on top of his body are on the same side and lower down the body.

He is still alert, tongue flicking and breathing normally.
Pardon the substrate, he dove under it when I went to get him out and a lot was still clinging to him when we took these pictures.

I'm probably going to take him to the vet on Mon, if we can get in, (sure wish I trusted the local vets more!) but I was hoping for some opinions/experience on what this might be and what I should be doing for him right now?
I'm going to move him to a "sterile" enclosure with paper towel substrate but not sure what more I should do.

Thanks for any help!!