The small particles on the nipple can be a variety of substances, the specific analysis is as follows: 1, fat particles, sebaceous glands secrete fat particles, can prevent nipple dry, nipple did not get cleaned solidified on the nipple surface. The actual fact is that you can find a lot of people who are not able to get a good deal on this kind of things. 2. milk particles, during pregnancy or breastfeeding, the nipples secrete milk, which is not cleaned and causes the milk to solidify on the nipples. It is a good idea to clean them promptly to prevent nipple eczema. 3, follicle blockage, sebaceous secretions gathered in the hair follicles leading to follicle blockage, forming sebaceous cysts. Keep the nipples clean and surgically remove the cysts. 4. mastitis, white or yellow particles on the nipples, accompanied by breast swelling and pain, swollen nipples, need to take anti-inflammatory drugs. 5. breast cancer, the nipples of cancer patients will swell and overflow, the overflowing liquid coagulates on the nipples and shows small particles.