Just wanted to chime in. I've been doing IM injections daily for years for various vitamins/minerals that I no longer absorb intestinally because of my autoimmune disease. If you do IM properly, it's not the needle that leads to scarring, it's the injection solution. I inject mag sulfate every 3 days or so and it is buffered with sulfric acid, so I have fibrosis in the injection areas just from that. My other injections, which are buffered with phenyl or saline, don't do this. Every 6 months or so, I take a break from the IM; I use topical DMSO combined with oral hyaluronic acid, collagen, MSM and chondroitin which dissolves the fibrotic lumps and they turn to normal tissue. Takes about two weeks. I also find that since I've been bodybuilding and achieving higher muscle mass, the injection fibrosis has been going away on its own without intervention -- maybe there's more healing resources available to the muscles, dunno.
For hormone injections I don't understand why anyone would do IM if subQ is an option. AFAIK, everyone I've met who does TRT does T by subQ.
If presenting with an autoimmune disease, look into total elimination of processed grains. (or any grains)..
WGA in glutens has been shown to mimic similar molecular structures within the body, triggering destructive immune response. (molecular mimicry)..
Plus grains can be responsible for epithelial dysregulation (leaky gut), combined with glyphosate, leakage can increase by another 50%..
Obviously drop ALL vegetable seed oils..... Plus refined fructose..!!