I never developed a abscess from it and when I say painful I mean the injected site hurts for a couple of days-nothing unbareable. But when you have 400mg per cc then the BA content is high therefore increasing the pain, but the more frequent the injects-every week-then the body gets used to the BA and instead of being sore for a couple of days it is reduced to like one at least for me it does. You can always dilute it with EQ/Deca and make it virtually painless