White spots on breasts during breastfeeding can be caused by the following: First, the nipple may be cracked for some reason, leading to breast ulcers, mostly because the child did not suck the whole nipple into his mouth when breastfeeding, and has been sucking repeatedly, resulting in breakage and the formation of white spots of ulcers. Secondly, it may be due to the accumulation and condensation of milk inside the breast, and the white spots will be formed when the milk is not treated for a long time and becomes dehydrated. Finally, there may be white skin formed by the child’s prolonged sucking, or it may be due to dryness and dehydration of the skin, as well as inflammation of the breast with bacterial infection, it is best to go to the hospital lactation department, according to the cause of the disease to choose the appropriate treatment, taking into account that breastfeeding is more critical, you must not self-medication.