Dr. Marie replied:

It's always hard to try to get a diagnosis for lumps online, so I won't be able to say for certain what is going on but I can give you a few ideas.

It's not really common for a hamster to have a lump on it's foot, especially a red one. My first thought was that it could be some type of infection or abscess. However, if this were the case it really should be bothering Cheeto. You would think she would be trying to get at it more.

Another possibility that is actually more likely is something called polyoma virus. This virus can be spread through the urine of hamsters. It can cause a couple of different type of tumors including one called trichoepithelioma and another called lymphoma and both of those can cause lumps to form.

Polyoma virus is very contagious so if you have other hamsters you will need to keep them separated from Cheeto.

One of the problems with trying to figure out what this is is that it can be expensive. The only way to know for sure would be have a vet do a biopsy of it. But then, even if we do get a diagnosis, we are not completely sure on how to treat these types of tumors (if that's what it is). Unfortunately they can often spread and cause a hamster to become very sick.

As with a lot of conditions with hamsters there is probably not a lot that can be done here. However, if you really want to know what is happening, a visit to a vet who is experienced with hamsters is a really good idea.

Dr. Marie.

---

Check out our dog age calculator and cat age calculator.

---

QUIZ: Is your cat secretly planning to murder you?

---