I have my first confirmed infection today. I large knot grew in my delt where I injected which seems to be normal but never was staying a little longer than usual. So I decided to press on the lump where I felt a pop. I knew right then . So I of course went to the mirror and saw the released fluid move under my skin as I pushed on where the lump was so I got a syringe poked a hole with a sterile needle after wiping the area and my hands clean with alcohol and sure enough puss came out. I started on atibiotics right away. I also then squeezed my swollen muscle and felt yet another pop. I thought it was always just painful because it was stealth gear. Anyway just thought I'd share my little story and the reason I believe that you should have an antibiotic on hand just as you would a an AI while cycling. jmo!