Cracked nipples are cracked nipples, and in severe cases, erythromycin ointment should be applied along with other care. Generally, the scab can be formed in about a week, but the exact time varies depending on a number of factors. If there are local ulcers, oozing, bleeding, pus and other symptoms, you need to first suspend breastfeeding on the affected side, clean and apply erythromycin ointment, express milk every 2-3 hours to prevent the accumulation of milk in the breast, and wash the erythromycin ointment with warm boiled water when you express milk. If you do not heal for a long time or more serious, you should promptly go to the hospital breast surgery for surgical stitching. If the treatment is not proper, it can continue for several months, and even form eczema, causing some impact on both the baby and the mother.