dry skin/scabs on butt

What kind of litter does he have? Some rabbits who sit in their pee (on non -absorbant litter) get urine burns which removes the fur.
But it might be some sort of mite. Does he live outdoors? A vet would be the best option for looking at Zinc since this is a forum Good luck.

Thanks so much for responding to thread. His litter is wood chips. Although, for the past 2 1/2 weeks he has not been in his litter, he has been free roaming in yard. As long as weather is good he is out. I will look into vets in our area and make an appt. I thank you for response!

thanks for posting this we just did a rescue on two flemish giants and one is losing hair and has scabs as well so this post helps a little on insite on possible options. Im sure we will take her to the vet if we cant figure it out on our own. I have never had a rabbit with this issue, but this one was poorly cared for so maybe its the urine problem like said about for my rabbit anyway. I hope you figure out whats going on with your little one

Hair loss? It might be internal but I bet your flemmies have mites.