Kitedemon. The vet said it can be as simple as a small scratch when eating or a tooth may have loosened up. Almost anything. His snake had it once his assistants bp got it etc. Ive never seen it swell that quick myself but he is the expert lol. He was great. No hesitation just stuck his hand in the tub and grabbed her lol. the price tag was decent too. it cost me $48.04 for the visit and 20 days of injections for her. A small price for my best breeder female i think. If there is anyone in the northern MN area i would highly recommend him. Hopefully i wont have to visit him for awhile but its nice to know that we have a great snake doc in the area who loves herps.