I have never heard of brachial radial pruitus until now. I have suffered from severe itching on my arms for 30 years. At first it only lasted a short time and only a few times a year. The older I get the more often it occurs. Lately it seems like a constant battle to stop the itching. Lately I have been to the ER twice in a couple of weeks. I scratch so much that my arm is dripping in blood. It switches from one arm to the other. Sometimes both at the same time but mostly one side or the other. No Dr. has been able to give me an answer. I've had two biopsys that came back as inflamation. How is brachial radial pruitus diagnosed? I never know what will bring it on or what will stop it. The only thing that seems to help is lots of massage oil 5x's a day on my arm.