The common causes of breast lumps are acute mastitis, cystic hyperplasia of the breast, breast cancer, etc. Breast cancer, for breast lumps cold and hot compresses have no therapeutic effect. 1. Acute mastitis: The treatment of acute mastitis mainly depends on whether the abscess is formed or not, and after the abscess is formed, it is mainly treated by surgery. The first thing you can do is to apply cold compresses to the area before the abscess forms, and hot compresses to the area when the lump is more pronounced. 2. Breast cystic hyperplasia: this disease is caused by the imbalance of estrogen and progesterone ratio, so hot and cold compresses generally do not work, you can use symptomatic treatment, the use of drugs, such as tamoxifen and so on. 3. Breast cancer: painless nodules for the first symptoms, the disease is usually related to estrogen and progesterone, can not be treated by hot and cold compresses, the main treatment is surgical treatment and chemotherapy, radiation therapy and so on. Breast lumps cold or hot compresses should be timely medical treatment, consult the doctor for specific treatment methods.