Been a few times this week people have started things with but they haven’t called me back ;(
It is swollen or changing colour at all, and is there any discharge? If so then might need to get it checked it.
It SJOULD be pretty obvious if your bra is rubbing change bra, or wear a dressing to cover the scr and see… Cover t with cotton wool or a pad and then cover with medical tape. If that stops it then you know it’s the bra.