My understanding was that it could cause a blockage and then mastitis if there was swelling. When I had mastitis the ABA counsellor said it could be caused by something as simple as the baby giving you an almighty kick in the breast that could cause swelling. So not the milk production itself but the ability to get the milk out IYKWIM.
It can according to a book I have- but it is much more likely to be an issue prior to pregnancy flourishment of glandular tissue, even then most likely minor unless it happened before puberty development finished (in the case of a surgery or a seatbelt crush across chest from car accident etc) in the book it compares it to dropping a rock on a flower bud as opposed to a full blooming flower - damage to a full flower is unlikely to be as serious or permanent. Hope you are ok though and not too sore.
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