Okay so the only difference in the appearance between breasts is right after pumping. The right side (the one that doesnt hurt) nipple is extended outwards like how it normally looks. In the left side (the one that is in pain) the nipple is the same size and it is the areola in contact with the horn that is extended. It never used to do this and i dont know what is causing it. I have tried different size horns but it is all the same!