Wasn't there an overestimation on how many times Iori have actually hit Minami "seriously". Also abuse is a big ord, domestical violence is a "better" fit. What Minami has gone through with her parents was abuse. With Iori, it's "just" domestic violence and again, most of them has been for comedy purpose. It's also the first time she need bandages for that, althought did Mikanuji will come back on that ? Probably not,knowing Mikanuji, we even probably never heard of it again. Just a reminde of what her parents abuse look like