It could be fleas, get her to the vet. With the gnawing though, that's how they keep their teeth short, without chewing on something, their teeth will continue to grow, and then it won't be able to eat. Hope this helps, good luck.
My Hamster Keeps Scratching What Do I Do?
Could be mites or boredom or both...
Mites are tiny black parasites that feed off your hamster and make their home on the hamsters skin. Mild cases of mite infestations can be treated with an anti-mite spray designed for caged birds or small animals available from pet shops. The head of the hamster should be shielded to avoid spraying into the eyes and the body sprayed. The cage should be cleaned, sprayed with the anti-mite spray and clean bedding should be provided. You may also want to throw out any hay or wood chips that you had when the hamster first became infected with mites in case that was the source of the parasites.
Make sure he/she is nice and clean if not it might have flees so take the hamster to the vet they will tell you what to shower him/she with
My hamster lai-la is scratching and I don't no what to do because scratching people say its bad to wash your hamster because the water and I don't want her to die because I just got her like 2 weeks ago ? Help please
When hamsters scratch, they either have mites, or irritated skin, but if its neither, change the saw dust as some hamsters need fine saw dust as there skin may be sensitive.
I have a 4 mon old hamster that has scratched or cleaned herself to the point she has no fur on the side of her face by her ear. Is there anything I can try before I take her to the vet? Anything I can put on the scratch?