You need to so way more research bro. Yeah, pinning EOD in the same area will irritate the fuck out of any site. Do the roundabout routine. Start with the left quad, then right, then right buttock, right shoulder, left shoulder and left buttock. Repeat. If you gear has high BA content then this method should still work. You simply can't overuse one site. Now IF the BA content is really high you will swell up no matter what. I recently did some T-400 and when I hit any site it would swell up so bad I couldn't train that muscle group. I tried cutting it with sterile grapeseed oil and warming it up , massaging the area; alkl to no avail. It was strong gear but a bad batch as far as BA and I had to quit mid cycle. Itching and swelling happens periodically with high BA gear but if it persists and the area gets warm and you get feverish then you are fucked. I lost half a butt cheeck twenty years ago for ignoring the signs of an infected abcess. Good luck dude.