The causes of breast lumps are considered to be as follows: 1. It may be caused by breast hyperplasia, which is the proliferation of the alveolar epithelium or ductal epithelium of the mammary gland, leading to the formation of lumpy nodules, and a few of them are accompanied by cyclical pains, especially before menstruation, and the symptoms will be more pronounced after overexertion and uncontrollable emotions. 2. If the lumps are easy to be pushed, and the surface of the lumps is relatively smooth and the surrounding boundaries are clear, they may belong to benign tumors of the breast. 3. If it is easy to be pushed, the surface is smooth and the border is clear, it may be a benign tumor of the breast, which requires regular review and follow-up. 3, it may be a lumpy object caused by the enlargement of the lymph nodes of the breast. 4, it may be a paratesticular breast and breast nucleus, and so on. Because many reasons can cause pimples on the chest, it is recommended to go to the hospital in time to clarify the cause of the disease, and then according to the cause to take appropriate treatment measures.