My big champagne d'argent buck has something wrong with his ears, I can see red scabs in them, the skin looks irritated... I have noticed him scratching one ear a lot a few days ago and today I noticed he was keeping 1 ear down and 1 up, I picked him up and inspected his ear, it is really bad and I can tell he is in a lot of pain. He has the same scabs and irritated skin in both ears but one has it like 10 time worse than the other. How do I treat this and what do you think could have caused it? He is in a open ground pen with lots of other rabbits and he has access to an extremely long and complex burrow system, do you think some dirt could have gotten lodged in his ear? The burrows are not fit to his size because my does are all tiny mixed breeds and do not make massive tunnels for him so it is a tight squeeze. I did not realize this infection or whatever it is sooner because I never handle the big rabbits like my champagne d'argent. He does not like to be held and I do not like to hold him. What should I do for treatment, I will likely move him to a small wire cage tomorrow so he stops using the tiny burrows but I need to fix this problem now, he keeps shoving his foot up his ear and then shaking his head and he sits around and looks all depressed... He is still eating and drinking but has stopped mating and playing with the other rabbits. I have had rabbits since I was in the 2nd grade but I never really had to deal with any health problems like this so I really need some help. I do not have a picture of the ear and won't be able to get one until tomorrow but it is all scabbed up and looks painful. This is a picture of him just a few weeks ago, you can see he has both his ears up and is alert with his little buddy coming out of the burrow. I can't see the infection in this picture but right now you would definitely be able to see a little bit of it. The main infection is in the ear facing the other bun and burrow.