I suspect there isn't a high risk of "plugging
" a less than sterile solution because it is, as you already said, a bacteria ridden area. I think that's the very reason why it would be safer than sticking it in to soft tissues where there should be very little bacteria, at least bad bacteria.
I would expect, but i don't know, that many of the bacteria would have a hard time crossing the lining to the blood stream where the drug
is rapidly absorbed so would remain in the colon but i have no idea if this is the case it's just a pure guess and even if it isn't, it's in the blood stream where it would be rapidly distributed so it isn't sitting in one place for long enough for any infection to take hold. It's not a nice thing to think or talk about, it's a rather taboo subject even among IV drug users, especially other IV users that we know in real life, they would look at you as if you were a weirdo (or gay if you're a dude). But it is a very efficient method of administrating a drug, in fact the speed of onset is so rapid that it is given to people who suffer from seizures, rectal diazepam
one of the brand name is Stesolid.
I seriously hope we are dealing with white H4 here and not black tar because if it's black tar PLEASE do not SC or IM that shit, it's nasty stuff to put in a vein let alone in the soft tissue. If it's somehow brown H3 that requires an acid (which i doubt cause it would burn like a mother fucker) then i'd dilute it as much as possible when "plugging" but i doubt that's going to be the case.
Personally, if i were in your place (not that i have EVER used illicit drugs
of course) i would simply stick it in a vein since we are already playing with needles. Just do what ever can be done to become proficient at injecting in to a vein. My fiend is a long term IV drug user, (7 or 8 years on and off, 2 or 3 heavy use) and his veins are in remarkably good condition (not that he is proud of it but secretly is) and he has to use brown heroin
3 which requires an acid. Almost every single long term IV user my fiend knows has great difficulty finding a vein and that is mainly due to using FAR too much acid but also bad technique.
I would suggest going to somewhere that you can discuss there things openly, not your doctor unless they already know because they will put that in your medical notes but somewhere like a harm reduction
service or something like that. Even a needle exchange out side a pharmacy.
Good technique, good vein care and rotation of sites should allow you to keep the veins in good condition.