Thank you for all your advice and the links to the site on abcesses. By reading all the information on abcesses and alternative treatments before we went to the vet, I felt much better prepared to ask questions and make decisions concerning Matilda's treatment options when we were at the vet's office.
On the day I took Matilda to the vet, I was doing errands first and happened to meet a wonderful lady who used to raise Flemish. She looked at the ball on Matilda's neck and agreed with me that it was an abcess. She had some suggestions, including requesting Baytril tablets - the brown ones instead of the purple ones because they are easier to crush.
The vet diagnosed an abscess and recommended surgery to remove it. Since Matilda is a breeder, who doesn't like being bred so I am unsure I will ever get any kits from her, I told the vet I didn't want to spend the small fortune on surgery.The vet figured out the dosage for penicillin by injection for a 14 lb rabbit, explainedwhere to give the subQ injectionand sold me 14 days worth of Baytril tablets. I stopped at Tractor Supply and got the penicillin.
Matilda had been chewing on the growth and the tissue where she was chewing was hard and dead. Since the abcess was growing and was annoying her, I decided to drain it, which I did by slicing the dead tissue with a single edge razor blade. There wasabout 1/3 cup of infection in the abscess and after I got it emptied I rinsed it out withsalt water. Matildawasn't upset about the abscess being drained but wasless than thrilled with the salt water irrigation.
I packed the cavity with dry table sugar (antibiotic properties in an anerobic environment)then put dry gauze into the incision to hold the sugar inside. Unfortunately, the location of the incision was at the front of the cavity, since that was where Matilda had been able to chew on it andshe pulled the gauze out a few hours later.
Matildais doing well, eagerly eating her Baytril mixed withcanned pumpkin twice a day and the abcess is open without any visible drainage. I will continue the Baytril and penicillin injections until the Baytril is gone. Since the incision was in the already dead tissue, I don't think the abcesswill close againand it now just needs to heal from the inside out. I looked at ihe abcess tonight and it appears to be healthy tissue inside with the tissue on the outside continuing to die on both sides of the incision. Matilda may end up with a bald spot on the side of her neck, but I think she is going to be alright.