The nipple is the opening of the breast ducts, and the breast gland has a secretory function, so secretions are discharged through the breast ducts. When the nipple opening is blocked, the secretion cannot be discharged and the bacteria will easily cause inflammation after invasion. This can be manifested as redness, swelling, pain, itching and discomfort of the nipple, which can be treated by local cleaning with warm water and oral antibiotics, and if necessary, mammography and lavage of the breast ducts. In addition, itching and discomfort can occur with nipple allergy and excessive scratching can be painful. A skin rash and localized redness may require oral anti-allergy medication. We cannot rule out local discomfort caused by trauma and extrusion, so pay attention to good nipple cleanliness and hygiene, and try to go to the hospital to have your doctor check the details.