There are many reasons for small particles on the nipples. The first of these is the use of a new product, a new product, which is a new product. 3, sebaceous cysts, sebaceous glands secrete fat to lubricate the nipples, long periods of time without cleaning the nipples, resulting in secretions trapped in the follicles to form cysts, need to clean the nipples and surgical removal. 4, milk coagulation, pregnancy and breastfeeding nipples out of the milk coagulation on the nipples, timely cleaning off can be.