And no, you don't even have to eat the cabbage.
I actually got the tip from Baby Magazine January issue, which was timely because my nephew made his Mom bleed from feeding. Basically you just put on some cabbage leaves on your breasts (used like a sort of breast pad) and it will help whatever needs healing to heal... enough even to make the next feeding tolerable.
My SIL was skeptical but since she was bleeding, she decided to give it a try. And it worked! And it's been working for her for days now, for any soreness, rawness and cuts.
So try the trick before heading out to buy expensive creams for your nips.
Cabbage is considered a natural remedy for mastitis.