Hey I really didn't know if this is the right forum but it has to do with your muscles I guess. When I am lifting a heavy box of things and have to carry it a ways... It feels like my muscle is popping under my skin on the under side of my forearm. Does anyone know what this is? I've asked friends and they think I'm crazy. It feels almost like a bubble of air under my forearm... It feels like it pops it doesn't actually make a noise.