It should be a cracked breastfeeding nipple, which is a common skin condition in breastfeeding women. This is a common skin condition for breastfeeding women. It may be caused by the child biting the nipple when sucking on the breast or friction damage from clothing to treat this condition. Generally, topical medication is enough, first of all, use iodophor to disinfect the affected area, if the inflammation is serious, you can apply topical erythromycin and clindamycin ointment, itch-relieving moisturizing ointment. If it is simple, because of dry and cracked can be applied vitamin E cream treatment. Of course, prevention is also very necessary step often change underwear, bra, massage nipples, and can be scrubbed with warm boiled water. You can also use a breast pump to suckle the breast first to feed your child.