Hi, I found a huge lump around the anus-belly area of my female dwarf hamster. It is a pretty big lump, pink in colour with a rough hard surface. It has no hair growing on it and take up a large part of the belly. She is not pregnant and the lump is too big to be some sort of clog. She is almost 3 years old now so its not worth spending money on the vet. Does anybody know what it is?