Small hard lumps found next to the nipple are commonly found in breast fibroadenoma, which is a benign tumor that occurs in young women and is characterized by smoothness, good mobility, clear edges and slow growth. Ultrasound examination can confirm the diagnosis. If there is no obvious discomfort and the cyst is relatively small, it can be observed and followed up without treatment. If the cyst is relatively large and has other uncomfortable symptoms, it is recommended that the cyst be punctured or surgically treated. Regardless of which disease the hard lump in the breast is found to belong to, it is recommended that a timely visit to the hospital be made to confirm the diagnosis with an ultrasound examination and timely and symptomatic treatment.