White spots on the breasts of a three-year-old boy may be due to a white cyst that formed during infancy. If there are white spots on the breasts of a three-year-old boy, it may be due to a white cyst formed during infancy, where the sebum is covered by keratin and cannot be completely exposed on the surface of the skin, thus accumulating on the underside of the skin and forming a white particle. It is not recommended to worry too much about this condition, no special treatment is needed, usually after a few weeks or months, the white spots on the breast will gradually disappear. It is recommended to take good care of the nipple, keep the nipple area dry, and do not force the white particles out to avoid secondary infection due to improper operation. Parents should pay attention to the child’s physical changes, if there is any abnormality can take the baby to the hospital in time to do the relevant examination, to avoid affecting the healthy growth of the child.