Originally posted by guster girl
The one I noticed second is a lump on his left shoulder. It's gotten bigger and has abscessed. I don't know if that's the right word for it, but, I can see red on his shoulder where before I just saw his light colored fur.
If it is an infection it is not a tumor. An abscess is an abscess, not a tumor. I would suggest taking him into the vet to determine what exactly the lumps are. Hamsters are prone to warts too, and it could also be a cyst. They can test the area to determine whether or not it's cancer. Surgery probably wouldn't be an option since he is older and such a small animal.