Suggest Remedy For Painful Sore Lumps On Skin After Injecting Drugs

Well I recently relapsed on shooyting uo heroin and I have missed more then get it in my vein I hsve these painful sore lumps under my skin and have been taking bactrum what my doctor prescribed its been almost a month and I went to there er one night they prescribed me the same thing but its not working fast encan you recommttouh because im in a world of pain what can you adviced me doctor I hate the fact it runs , my every day life pleaae help