Pet Health ConcernsPost here if you are in need of a response regarding a pet health question. Medical advice cannot be given, only previous personal experience. (Archived since 5-20-08) NOTE: THE INFORMATION ON THIS BOARD CAN NEVER BE SUBSTITUTED FOR THE CARE OF A VET. If your pet is ill, call a veterinarian immediately, do not post in this forum.
Is this a brand new hamster? If so it is probably wet tail like Roxy said. But if it is a hamster you had for awhile, it could be a tumor, I had a hamster once bleed in that area, and it was a tumor and she was chewing on it, causing it to bleed, in her case it was a fatty tumor and she was not suffering and she lived quite awhile w/it. And definetly call a vet.