Yes they do. They are 2 brothers and they are 10 weeks old. I spend lots of time with them and I haven't once seen them be slightly aggressive with each other
Only one of my two bunnies have it. I was petting him and I felt a hard bumpy spot on his shoulder and when I felt around I found more on his neck. I tried looking around on the internet but couldn't find anything. The only thing I could think of was a mosquito bite because he was itching them