My hamster also has that and I have been giving him a new type of food.So I'm going to pray it's not a tumor.
My Hamster Has A Swollen Tongue And Is Hanging Out His Mouth What Should I Do Apart From Taking It To The Vet?
This could be a tumor, in which there is nothing you could do for it. This could also be an allergic reaction to food? Did you give it any new treat or food?Can it swallow? This really should see a vet. Immediately.