Burning breast


So after a breast feed or pump the side of my boob burns. Like along the vein area on the inside. During feedings it can burn really bad! But I dont have nipple pain. Baby seems fine, no white in the mouth. No flu like symptoms or lumps. What could cause this burning? Its driving me crazy!!! Feedings suck in my left boob cause the burn. But that's my over producing boob so.. idk. Yall know? I'm seeing the doc Thursday. Btw her latch is perfect. No nipple pain on either breast. I only feel the burn on that same side of boob where a blue vein is during feeding on it. Sometimes worse than others.