I can see it. My first guess would be that somehow during eating he broke a tooth or something. I'd gently peek in his mouth to see if you notice anything off and just generally keep an eye on it. Probably will heal on its own, but get him to an experienced reptile vet if you are seeing cottage-cheese looking stuff in his mouth or if the swelling gets much worse rather than better. Almost always this kind of thing has healed on its own for my snakes, but on occasion I've had to intervene by 2x a day diluted iodine rinse, gently scraping of necrotic tissue, and a course of antibiotic injections.
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