We bought two female dwarf hamsters 3 months ago. One started to develop a sore on her back end which had grown and is now red raw and bleeding /weeping. Took her to the vets before this stage but nothing was really advised except to say that it might be an injury. We bathed it and changed to a soft bedding. As it's now much worse, I'm taking her to another vet tomorrow but wondered if anyone has any experience of this?