A lot of this is stuff I picked up over a decade of dealing with chronic and painful acne, so I’d probably have to spend an evening finding different articles lol
But, yeah, acne comes from inside. It’s a more like an allergic reaction, where a normally helpful part of the immune system freaks the f out and causes harm. The bacteria that and normally lives harmlessly in our skin oil. And it’s not even always the cause! Sometimes bacteria doesn’t grow inside the zit at all, though it usually does and when it does it usually makes it a lot worse.