checked now: the spot is still quite red and is BARELY puffy. you can barely tell there's a lil bit of a bump. it doesn't seem to be getting any worse.
I took a little cotton round and dabbed it in water and betadine and very lightly gave the spot a little dab. I didn't want to risk infection, especially if there was an open spot for bacteria to get in. He doesn't react when I touch it, no twitching or the thing where ball pythons are like "ew get away" and pull their scales away from your fingers. he has no other spots on his belly, body, head, neck, tail, or anything like that. other than that one spot he's a perfect lil bel.
he also yawned while I was handling him and I didn't see any excess saliva in his mouth.
I suppose I'll just keep an eye on it for now, he'll probably heal it on his own. if it's still there in a month, I'll take him to the vet. I don't see anything getting worse.