I just talked to the vet. The biopsy results were not conclusive. There were not enough cells intact for them to make a diagnosis. They did find inflamatory cells but no bacteria.
The doctor is recommending surgical removal of the growth which they will send in for testing since the antibiotics are not working and she is now bothered by it. The growth is still increasing as well.
They are going to call back with an estimate, and I have to talk to Penny's daddy about the surgery. He was pretty sure we'd have to have it removed, but this is not good news.
Also, we need to keep Penny and the new baby separated until after surgery. Poor Penny.