This may sound weird, but in the last 2 months, I've been getting an infrequent sensation of my leg hairs being pulled out in one spot of my leg, about the size of a poker chip. It's on outboard side of the leg, a few inches below knee level. The first time it happened I was on my hands and knees cleaning out a sump. I thought, man I must have some old chewing gum or duct tape inside my pant leg, but there was nothing there. Then a little while later, the muscle in that area will twitch. It's happened again several times, always when my knee is bent at a certain angle. I'm assuming it's nerve related, since it's triggered by the position of my leg and knee. It doesn't happen when my legs are straight, but it also doesn't always happen when my legs are bent.