Mastitis lumps can be treated with magnesium sulfate as a topical topical compress. Milk can not be discharged in time, resulting in milk stagnation in the breast ducts, which will lead to inflammation of the mammary gland, which in turn will lead to localized swelling and pain in the breast, breast lumps and other conditions. Magnesium sulfate has anti-inflammatory, pain-relieving and swelling-reducing properties, and by applying magnesium sulfate externally, patients with mastitis can relieve the pain and make the lumps dissipate. In addition to treatment with magnesium sulfate, hot towels can also be used for hot compresses to promote local blood circulation, reduce local milk stagnation and relieve symptoms. Antibiotics are also needed if there is fever, and surgical drainage may also be needed if abscesses form and cannot be drained. It is recommended that patients with mastitis should consult a doctor in a timely manner and standardize their treatment under the guidance of the doctor.