My step dad took Mr. Hammi Pants to the vet this morning and it was an abscess. I wish I could have been there to take him myself but I'm glad this has been taken care of so quickly. It must have hurt him even though he seems not to show pain. Somehow he got a puncture in his cheek and it got infected. I do not really know how this could happen because the two hamsters don't live together. The only time they were together was when they were in their own separate hamster balls. Could it be possible for her teeth to go through the slits and catch his cheek? I think that's unlikely, but I've also checked his tank for anything sharp. There is a cotter pin on his wodent wheel, but its not sharp at all. It could have been a bug bit that got scratched and then infected, but the vet said that it was a definite puncture wound. So I'm clueless. Only Mr Hammi Pants knows. He is to take a course of Panmycin Aquadrops 2 times a day for 10 days. Then he should be ok. Thanks everyone for your well wishes and kind thoughts towards him. He is coming to work with me for an hour so I can keep an eye on him since I'm going to be giving him his meds soon. ( when he gets up from sleeping) I'm glad it wasn't something like a cancer. I'm very very glad!