Breast nodules with poorly defined margins can be specifically observed by ultrasound to see what is going on. If the nodule is 0.2-0.4cm and the edge is not clear, it is considered to be a nodule caused by breast hyperplasia. At this time, you can take oral Chinese medicine to treat the symptoms, and then regularly review the ultrasound can be. If the tumor is around 0.4-0.8cm, it is considered to be caused by breast fibroid, and minimally invasive surgery can be done to remove the tumor. If the tumor is 1.0-1.5cm and the boundary is not clear, it is recommended to do mammogram or cytology for further examination to exclude the possibility of malignancy.