Off the top of my head: Epsom salt baths, tiger balm, arnica (it can be rolled on). Let me get back to you once I’m not walking around lol, but where in the arm is it exactly as well?
It's just the hand @coyotl
I don't know if my normal doc can help @XPac
It's probably because of my lymph nodes being removed during my cancer surgery, tends to happen when I lay on my right side and that's always where I wake up despite falling asleep on my stomach @Kouryu-Grin