Im an newbie but I recently experienced a similar situation.First pin right glute, 2nd pin left glute 3rd pin right glute 4th pin left glute and this baby sucked. Was sore and red the whole time had a golfball size lump in my left ass cheek. My honey is a 20 yr experienced critical care nurse and she pinned me. I really doubt she did anything wrong as she is magnificent in what she does however, Ive read article and article over and over to convince myself that this happens some times. When I would do light cardio it would not feel as bad. Laying in bed it felt hard. I went to see my doc(who has tons of experience with injectible AAS) He felt around a lil gave me a slap right on the spot and said you ll be fine buttercup. He said move your injection sites, my next pin was right quad, next one left quad. No more issues. A heating pad was a big help. When she pinns me or I pinn myself as I have now learned how, I inject the oil very slow and continue to massage the area after withdrawing it for several minutes. I have also noticed if I do legs that very next day, it seems to disperse more. Try the heating pad for some comfort and work on rotating. Its common I found tons of threads on it in here.