There are many reasons why nipples are white like pus, which are analyzed as follows: 1. Sebaceous gland secretions. The nipples have not been cleaned for a long time, resulting in the accumulation of sebaceous secretions in the area, which have solidified into particles. Wash your nipples in time to ensure that they are dry and change your underwear regularly to prevent nipple inflammation.2. Milk coagulation. During pregnancy or breastfeeding, breast hygiene is not well maintained, resulting in the milk produced by the breast gathering on the nipple. You can always use a clean towel to wipe your breasts and keep them dry.3. Pathologic nipple discharge. For example, breast cancer patients will not only have breast pain, nipple retraction, breast cellulite changes, and nipple discharge, the discharge may be white, yellow, or bloody, need to be highly vigilant, timely go to the hospital for histopathological examination, surgery and chemotherapy.