The hard lumps should be treated according to the cause, such as massage for residual milk, or medication or surgery for mastitis or breast hyperplasia. 1. The residual milk: If it is simple residual milk, the general symptom is only a lump, and there will be no local inflammation manifestation. It can be unblocked through massage, hot compresses, breast pumps and other means. The massage should pay attention to the way, method, and remember to be gentle, so as not to cause damage to the milk ducts. 2. Mastitis: The bacterial infection secondary to the blockage of the milk ducts can be manifested in the form of lumps, as well as localized redness, swelling and pain. Before the abscess is formed, antibiotics, such as cefazoxime, can be used for treatment. After the abscess is formed, it should be treated by surgical incision and drainage. 3. Mammary hyperplasia: It may also cause milk return and hard lump clinical manifestations, which may be accompanied by pain, and can be treated with drugs such as oral tamoxifen, and if the pain is more serious and the hard lump is larger, it can be considered to carry out local mastectomy treatment after the end of the breastfeeding period. In addition, benign and malignant tumors of the breast may also lead to the return of milk with hard lumps, return to milk with hard lumps should be timely medical treatment, by the doctor for professional diagnosis and treatment, the use of medication need to comply with the doctor’s instructions.