My first assumptions would be the same as yours, abcess or tumor. Seems like the vet is definitely the best way to go with this one. Obviously a tumor would be worst case scenario. I had a yellow rat snake when I was like 9 or 10 that got a really bad abcess from being bitten by a garter snake he had been temporarily housed with. The vet drained it and gave me antibiotic injections, but he still ended up dying a few weeks later. You asked if anyone had ever seen it before. That's really the last time I can remember having to deal with something that looked (exactly) like that. Good luck, hope it doesn't end up being too serious. Maybe it'll end up being a new late-developing unicorn morph. Just kidding.

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