Cracked nipple is a superficial ulcer that occurs on the nipple during breastfeeding. It often occurs during the first week of breastfeeding and is more common in first-time mothers than in menstruating mothers. The diagnosis of a cut-like pain and blood oozing from the nipple when the baby sucks: Early in the lesion, there is a cut-like pain in the nipple when the baby sucks, followed by blood oozing from the nipple, or a thin yellowish fluid oozing, which dries and forms a crust on the nipple surface. If the baby continues to suckle, small cracks or ulcers appear on the nipple surface. This is the time when the nipple is red and swollen, and there is severe pain when breastfeeding, the crust can also be softened and rubbed off, and the fissure then becomes larger. The nipple chap is circumferential or vertical, circumferential chap is often at the base of the nipple and the areola connection, such as deep cracks, the nipple can be partially broken. If the vertical chancre is severe, the nipple can be split in half. Bacteria on the cracked nipple can cause illness in the breast. The chancre bleeds, and the breast baby inhales the blood into the stomach, forming a false black stool in the baby. The diagnosis is confirmed by the occurrence of small cracks and ulcers on the surface of the nipples of breastfeeding women and severe pain while breastfeeding.