Ohhh, heeey, you know, when I FIRST went to see Tank, he had a little bald spot in about the same spot. It was a little smaller, but it all grew back just fine. The lady said that he got his butt stuck to a scotch lint roller, and when they pulled it off, weeeeell… but by the time I took him home, and he won’t let me brush his butt really, but there’s hair there just the same as there is everywhere else. He’s also shedding up a storm xD
Also, from the HRS site:
Bald spots on rabbits are quite common when they are shedding. I have one Angora rabbit for instance, that gets totally naked except for her face and feet. But, short haired rabbits can do the same thing. If these bald spots occur from shedding, they will begin to grow back within a week or two.
on this page: http://www.rabbit.org/faq/sections/groom.html
Plus the example Jerseygirl linked… I think it is okay if you relax a little (; You might need to check him over for other problems, but I think it will come back. If you think about it, rabbits are probably pretty good at growing back fur–they rip it out on their own if they become preggy. (;