Today I noticed that one of my girls, Kitty, has what I think is a tumor on the side of her face, on her cheek area. It seems to be pretty heavy because her head tilts to the side, and she's walking funny and lopsided. Also, the "tumor" seems to have what looks like a big scab on it. I have no idea how it grew so quickly, because I see them and play with them everyday, and their cage is in my bedroom, and I'm SURE I would have noticed it. I'll be taking her to the vet Monday when they open. My question is, is there anything I should be doing/not doing until then?