It's not an infection, it's a reaction to the filler. IGF sold cheap is cheap. Even though it may show high off levels on blood test, Igf cost at least 3 to 5 x more then what most sell it for.
I've used probably well over 100 vials of IGF I've had some give me red welts that itch, I've had some that did nothing. Most get it from Chinese suppliers which is fine if a good source.
Don't get all worried thinking you have an infection, AA will cause inflammation it's acid. Also the filler mannitol which many use can cause an allergic reaction. The bumps you have should go away, if they get worse and start to cause fever etc then yes see a doc but I think you are fine. I have a buddy who can't inject IGF because it burns so bad that he can't stand it, I on the other hand can inject all over with AA and don't have any issue at all.