Nipple secretion of oil and metabolism, bad habits and breast disease and other factors. 1. Metabolism, due to the body’s cells and skin is not static, always in the process of metabolism, if the metabolism itself is faster, and do not pay attention to clean, will be manifested as more oil. 2. Poor living habits, if you do not pay attention to personal hygiene, tight clothing or have the habit of eating high-fat food, it will lead to increased secretion of oil. 3. Breast diseases, such as mastitis, breast hyperplasia, intraductal papilloma, breast cancer and other diseases, may also have pathological oil secretion. It is recommended to consult a professional doctor in a regular hospital in time.