[jasthace]

I've had this before also
It was doing delt injections,the swelling would move down to my arm {bi and tri}puffy and sensitive to touch.
I used the same gear with the same result{effect/prob} three times,so I put the vial aside,while I considered what to do with it.
I didn't really want to throw it away as I knew I had brewed and filtered it with the utmost sterility.
After a few weeks I decided to add a bit more bass oil{I reduced it}
I had no more problems after that.
I suspect it was the BA.