Acute mastitis is an acute purulent infection of the breast, an inflammation of the connective tissue in and around the ducts of the breast. The main causes are bacterial invasion, milk stasis, nipple cracking, and decreased immunity. Prevention: 1, the key is to prevent the stagnation of milk, while avoiding nipple damage, and keep the local clean (warm water can be cleaned). 2, to develop regular breastfeeding, the baby does not contain the nipple and sleep and other good breastfeeding habits. 3.Every time you breastfeed, you should empty the milk. If there is stagnation, you can use a breast pump or massage to help empty the milk. 4.The nipples should be washed after breastfeeding. 5.If you find that your nipple is broken or ruptured, you should treat it promptly. 6, pay attention to the baby’s oral hygiene and timely treatment of its oral inflammation. External treatment: 1, buy half a pound of onion, remove the head and green onion, chop the white onion, decoct water and smoke the breast externally. 2, breast massage – first lightly pull the nipple several times, and then gently massage from the breast around the direction of the nipple, the depressed milk gradually discharge Note: first apply a little lubricant to the affected breast, the patient or operator with five fingers from around the breast gently massage in the direction of the nipple, do not squeeze or rotate squeeze, should be applied downward pressure along the direction of the milk ducts, in the massage at the same time with the hand lightly pull the nipple several times, in order to expand the nipple part of the milk ducts. 3, potato slices cut into 0.3-0.5mm thickness, external breast, half an hour to change once, 2-3 times a day. (If the winter is cold, before dressing the breast can be soaked in warm water potato slices after external compresses) 4, cactus external compresses: take fresh cactus 60-90g, remove the thorns and skin, chopped, mashed paste, add the right amount of egg white, mix well, spread on cloth or gauze on the affected area, fixed with adhesive tape, 1-2 times a day. You can dress the breast at night before going to bed, the next morning to remove. 5, nipple cracking, should stop breastfeeding.