That definitely doesn’t look good. Is it an actual mass, or just redness/swelling from the absence of fur? It’s difficult to tell from the picture.

Regardless, this is something that needs to be evaluated by your rabbit vet. We’re not going to be able to offer any treatment or diagnosis advice, he needs to be seen. It’s not an emergency, but I would try to get him in THIS WEEK.

It’s really not possible to tell just by looking – a vet is going to feel the mass, maybe do a cystology, look in the mouth. I understand about a vet not being competent with rabbits but I imagine a vet could at least take a look at it and make a determination on what it is. Even if you knew what it was, you would still need some treatment.

Dealing with that is definitely going to require medical training and equipment, the best option is a vet even if s/h isn’t a rabbit/exotics vet. A human Dr isn’t going to be better.

You might be surprised and be able to find someone with more experience than you think. Is there a small local petting zoo near you? They might recommend someone.

You can also consult with us about everything each step of the way.  For example, a common mistake vets not familiar with rabbits makes is saying no food before anesthesia.  This is correct for cats and dogs, since they throw up, but wrong for bunnies, who can’t throw up and can go into stasis.

Glad to hear it’s healing! Rabbits can form abscesses rather easily, so I’m glad you were able to find vet care for him.

Thank you for the update!!! I hope your bun heals up well!

Thanks for the update!! It sounds like the vet you found was a true find-how lucky! Please keep us posted on the recovery