If your baby’s poor latch has injured your breasts or chest, your lactation consultant might recommend a nipple shield
https://www.sdbfc.com/blog/2015/3/26/dos-and-donts-of-using-the-nipple-shieldhtml
https://kellymom.com/ages/newborn/nb-challenges/wean-shield/
Tips for healing: https://kellymom.com/bf/concerns/mother/nipplehealing/