Breast nodules usually do not go away on their own and need to be followed up and observed. Breast nodule 0.3×0.2cm usually refers to the size of the breast nodule. Clinical breast nodule examination method is mostly breast color ultrasound, the principle is through the ultrasound will produce echo when encountering obstacles, because most of the breast is fat tissue, low density, and breast nodule density is higher, so it can be shown. And 0.3×0.2cm can be understood as the longitudinal and transverse diameter of an ellipse. Most of the breast nodules are fibroadenomas because they are the most common benign breast tumors in women. Fibroadenomas show self-limited growth, usually maintaining a certain size and persisting for several years, and generally do not disappear on their own. Clinical diagnosis is based on clinical palpation and ultrasonography, while pathologic examination is the gold standard for diagnosis. Meanwhile, breast nodules can also be seen in breast cancer, breast hyperplasia, chronic mastitis, breast tuberculosis and other diseases. There are many diseases that can form breast nodules, so it is recommended to consult with regular hospitals to clarify the diagnosis of the disease and then standardize the treatment under the guidance of doctors.