Hard lumps in breasts during breastfeeding need to be kept clear of milk and treated with antibiotics if necessary. Most of the hard lumps in breasts of breastfeeding women are related to milk stagnation, and it is important to keep the milk clear so that the stagnant milk can be emptied and the possibility of infectious diseases such as inflammation of the mammary glands can be reduced. In the case of a lump, the first thing to do is to feed the breast containing the lump to the baby, because the sucking action of the baby can quickly remove the milk from the breast, which is very important to ensure the health of the mammary glands. If the lump cannot be emptied simply by sucking, it should be properly massaged, and the massage should be performed from the lump toward the nipple, gently pushing and pressing to assist in the emptying of the stagnant milk into the milk ducts. In the massage, the strength and technique must be mastered just right, too light can not play a role, too heavy easy to cause damage and lead to local infection, specific need to follow the doctor’s instructions. When mastitis occurs in the clinic, antibiotic treatment can be given, which is very important for controlling the infection and reducing the formation of breast abscesses.