For me it varies. Occasionally it looks like a bruise showed up from Friday's injection, but all the injections I did afterward caused no issue at all. As for the burning sensation, increase the number of bac units in your injection.
Keep digging into the subject, get involved in various groups, verify what you find, and never skip cross-checking! Stay on top of reviews, and TG is another place where sources show up (stay cautious and best of luck!)
Reta is going to change everything
With my ghkcu I never skip adding additional bac. Occasionally it has caused a sting or a small welt. Pinning kpv first appears to prevent those reactions from happening.
I've been lurking around here forever, but I don't think I've ever actually posted. Right now I'm stacking Reta, GHCKU, KPV. Lately I've been getting more into the organizational side of things — labels, pens, wraps, storage 🙂