It's really not a huge spot, I would be mixing my primo shot with alil test or whatever else I'm using, warming it up alil u don't want it to hot and pin ur glute and use a 25 guage 1inch or if ur alil leaner u can get away with a 3/4 pin, after u pin massage the spot alil if u got time use a heating pad where u pinned it'll help it absorb a bit. Also the best time to really be pinning is after a nice warm/hot shower. Another thing don't rush the shot to where ur pushing on the back of the plunger and shaking like a leaf just apply steady pressure, the faster the oil goes in the more inflammation ur causing inside, take ur time try not to shake go deep enough and u shouldn't have an issue... Even Bayer primo comes usually with some pip now usually pharma grade tend to use a bit more ba. Luckily I'm not that sensitive when it comes to pinning unless it's in my quad which I stay totally away from now, last thing I want is a chunk of my quad missing or even a build up or scar tissue there.... I prefer glute,delts,chest for small oil shots and lats.... Everyone is different u gotta find what works for u. As long as iv mixed alil test cyp with my primo iv had no issue some days I can't even tell I pinned