PLEASE HELP BAD MISS SHOOTING METH!! ARM VERY RED AND PAINFUL! Only getting worse! So I have had cellulitis in the past from injecting math and missing. At that time, it was close to my heart and I went to the hospital for it. They put me on IV antibiotics and I stayed for four days. The same thing has happened to my other arm, but it is below the elbow. I am wondering if I can treat it at home by buying a z pack from the race brothers or if I will have to go to the hospital????