might be an abscess- be careful It is true you can sharpen or at least get the burr off an old set with a matchbook- but you need to find a needle exchange program if you continue this - {NJ has a few of them}- I myself have given this method up 20 plus yrs ago- Nothing good will result from this continued method
told ya. i always read these horror stories about people having to go to the hospital and dig out like a 4 inch diameter hole from their arm i just dont understand what the hell they are shooting in there to infect it so bad. Im assuming mostly crystal meth and that stuff