i got a rash after about my third shot on my right ass cheek, yea i know i should have switched. so yesterday i shot it in my left cheek and got a little rash again, i think it is from using the same seringe. i use the same needle to pull it out with and the same 3ml shot to inject it. but i use a brand new untouched 23 gauge needle every time. should i use a fresh everything ?