I have had my dwarf hamster, mashka, for about 5 months, & she was about 3-4 months when I got her. A week and a half ago my friend was playing with her when she felt a hard lump on mashkas right side, kind of under her. Today I saw mashka stretch against her glass cage, & I saw that the bump is now red, & that it has gotten a little bit bigger. There is still hair around it, and she is acting perfectly fine(eating & going to the bathroom). I don't have the money to go to a vet, but I want to know what it could be... ):