yeah here's an interesting question...
the other day i took a dose in the delt like usual...after a week there was a hard red knot about halfway up my upper arm..no where NEAR the injection site. Did the pin not go deep enough and it filled up between the muscle belly and adipose tissue? or does that just happen randomly? it's like someone shoved a walnut about an inch under my skin. It matches the ones i get in my delts..but for some reason this one is in the middle of my upper arm.
I'm using a 1 and 1/2" pin..i know I'm not so fat that it takes more than that to hit a decent intramuscular injection.