My hamster, Fuzzball, is around 4 1/2 years old. He has a funny bump on the left side of his tummy. It doesn't really have any hair on it, but it doesn't have any yellowish color like a scent gland would. I tried doing some research but couldn't find anything similar! I'm not sure if it's a tumor or what... thanks so much! Let me know if you want me to post a picture, too! :)