I got an infection in my right quad a couple months ago cause I resused a needle that had been lyin around for a while (I know, stupid move)...I got a pain in my leg only a week or so after I made the injection...It hurt like a bitch, I could barely walk, I couldn't bend my leg and I got a fever at one point it was up to 102 degrees! Finally went to the Doc's 2 weeks later then went straight to the ER for surgery...If you're having any of these symptons go to the doctor FAST it can be fatal if u don't take care of it soon and the pain will only get worse!