are you sure its a her? if so, It is cancer. or a cyst, or a polio scar. It could be a fat deposit. animals tend to get those. How old is the hamster?

Do you have two hampsters?

If so, she could be pregnant.

Hamsters are quite prone to getting tumors. They can be surgically removed. If left long enough, they usually get so large that they interfere with the animals’ ability to move normally and will often ulcerate.

Syz is our expert…So————> Vet’s office soonest.

she’s two. and lives alone. she had children a long time ago but ate them. I know…gross.