That's funny my damaged side with DS1 was also my high flow side. Don't know if that's why it was that side that got damaged, because he fed differently on that side. DS2 seems to prefer the opposite side lol.
I put diluted apple cider vinegar on mine when I get cracks. It's healing and can prevent/fix thrush. Like coconut oil, it has a lot of good qualities for both mum & bub.
it does sting a bit, but it depends on how well diluted it is. I find the sting handy to know there is a crack, so I can heal it before it gets worse.
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