Other name of Urine Burn is Hutch burn. Its most common reason is dirty environment. So keep its cage clean and dry. It happens when an organ gets exposed to filth, then chances of this disease increases mostly around genitals or inside of hind legs. Rabbits hate to get complete bath. They find it as a threat to their life so its better that you clean them gently and dry the area without hurting them. Try tea soak in urine burn to clean it. Reason of ear mites in your rabbit is same as that or urine burn. Try to keep its surrounds clean.
My rabbit keeps getting ear mites in her right ear for some reason is it because I am a bad care giver or what