Small white spots extruded from the breasts may be milk scale, sebaceous cysts, cornu rashes, mastitis and so on. 1. Milk Scale: During breastfeeding, the amount of milk secretion is relatively large, and small white spots can be squeezed out of the breasts. You need to clean it and keep your breasts hygienic to avoid infections. 2. Sebaceous cysts: they are benign lesions and tend to occur in areas where sebaceous glands secrete abundantly. The cysts are higher than the skin surface, mostly single, soft, and can be extruded with grayish-white contents. There are no obvious symptoms when there is no infection, but the infection will be accompanied by redness, swelling and pain. 3. Corns: Sebaceous glands are blocked, and sebum secretion is exuberant, there will be needle-like or rice-sized pimples on the skin, the color is milky white or yellowish-white, there are no obvious symptoms. 4. Mastitis: It is easy to develop during breastfeeding, as breasts are prone to stagnation during breastfeeding, and the environment of the breasts is humid, resulting in the extrusion of small white spots. It is recommended to consult a doctor to clarify the cause of the disease.