BA amounts have to be pretty high to cause any type of pain. That is a myth that has been floating around for years.
I would put a pin thru stopper, not touching oil, and place bottle in a pan on stove, then heat for a couple minutes. Yes it will evaporate some of the BA but I only do this to make sure it is in solution. Even if you don't see crystals, which means it's completely crashed out of solution, you can sometimes see hormone swirls under good lighting. This can cause pain while in depot.
Sometimes it's just the raw the sponsor ended up with, sometimes it's not made 100% the best it could be, or sometimes it's just the person using it.
If it continues to be painful, you can try to find out what type of oil they used, and cut it, but again you would need to remove the top, add to a 20ml sterile vial, cut it at the concentration you want, heat and swirl until clear, then filter into a sterile vial
EO typically will cause redness, irritation, etc, not as much pip.