Ill start by saying im fairly new to IVing. Im a long time opiate/heroin user though. Ok so just a while ago I did a shot of black tar heroin, used some cotton as a filter. This was about 30 mins ago. After finally hitting a vein and injecting, about 10-15 mins later, I looked down at the crook of my arm and noticed a big puffy circle where I injected at. The puffy circle is surrounded by lots of redness. Ive yet to see this out of my 20 or so IVs ive done and is starting to concern me. I will attach a picture as soon as I can. If someone could help me figure out whats going on I would really, REALLY appreciate it. I am trying to avoid going to the Dr/ER at all costs, unless absolutely necessary.