Alright so I started using glutes recently and I use a 23 gauge 1 inch needle. My ass is really lean and small and overall bf% is around 7% so I don't doubt it gets to the muscle.
Now however, out of 5 injections so far 2 of them caused the swelling (more like tenderness) to reach the coccyx bone which is that bone/ball bone right above your buttcrack.
I want to know why does the tenderness occur in that area? It makes laying on a bench or getting in a car a hassle.