JackD is pretty darn close and ATW has it right the part she spoke of too. By the way thanks for everybody's confidence that i would have the answer.
There are many scenarios where knotting may happen and this is not something that alot of jokers on this board could'nt answer, by the way.
Scenario 1 (I think most common):
Subject injects a product into muscle- then the body absorbs solvents and carriers at a faster rate than actual ingredient leaving those ingredients (crystalized) at the site and as ATW said the body attacks this and causes inflammation at the very least. Sterile abcess- much worse.
Why does this happen? Well in some of these UG formulations- it holds ok in solution at the proper storage temps. That's all fine and dandy. BUT- what happens to what once in the muscle? What does the body absorb and/or process the fastest and is that medicine so into the solution that it will be absorbed together at a more even rate? Or is the rate of absorption at a more equal rate(less common).
What causes this: The super high mg products or hard to hold products. Usually bc they are not properly formulated and for some instances there is no proper formulation for these super high mg prods or hard to hold products for some ppl. They are a liability- PERIOD.
Why Pharma co's dont produce them in high mg products. Yes one can use
Guaiacol or Benzyl or Octyl Salycilate and these both fight inflamation and mask pain as any NSAID would but even these have their limits on what they can hold and that limit is even less inside the body bc the way the bod will process them and break them down. possibly leaving medicine at injection site.
No longer in order of commonality:
Scenario 2(as related to #1):
These harsh solvents and such can cause the problem themselves:
possibly by tissue damage causing injury
possibly by cell damage causing mild necrosis
and in case of the salycilates (octyl or both) it can crystalize itself in the body.
And a host of other rare pssibilities like reversible nephritis(renal failure) due to delayed hypersensitivity.
In the Case of EO- alot of allergic reactions to it and just plain sensitivity to it. Any product carried in it needs to be PH balanced for 1 thing to make it more tolerable. I quit using it.
So the question for the hard core is:
Risk the above and harsh solvents which at very least are bad for me or inject more easily bio-processed oil that is good for me if it's certain kinds: cottonseed, sesame seed, safflower, grapeseed are all full of ant- oxidents however food grade should only be used if it's refined and expeller pressed. And even then - not so much. I forget the name of what the problem chemical/s that's in food grade oils but I'll look it up. Pharm grade carrier oils should be used.
Scenario 3:
Problem- improper filtering, transferring techniques cause contamination and re-contamination of gear.
When gear is exposed to air after filtering it recontaminates it with bacteria, pollen, allergens, pollutants, contaminants can be from cocaine dust to fecal matter to human or pet dander.
How does this cause knots besides the obvious allergic reaction and foreign substances? Well- bacteria or spores- if it's the right ones and bacteriostatics like BA dont kill it. Bacterio scidals kill, bacterio statics prevent growth. However BA will kill most bacteria- not spores- BUT when dead bacteria goes into the body- do you think the body is gonna wait to discover it's dead? or attack it immediately then figure it out? Ever had 1 day roid flu as opposed to longer even with long acting compounds? probably due to dead bacteria or other contaminates in the gear.
Scenario 4: (Related to #1)
shoot into scar tissue and it get stuck there causing a knot on up to sterile abcess.
And that's all I can think of right now as I'm in a hurry : )
I bet Shine can elaborate.