i dont thinks its allergies...unless you are allergic to the BA...the pain is caused from numerous things...i have prop now that is painles....but it can be caused by the powder, the ba, the bb, the oil, the filtering, the cleanliness, and the injection itslef...try and run it under some hot water in the vial or syringe to help it become less viscous and that should help a bit...also try and rub it in after your shot, like a light tissue massage...