Hard lumps in the armpits, that is, swelling in the armpits, can be seen for many reasons, and the common one is the enlargement of axillary lymph nodes. There are many reasons, such as after trauma or breast hyperplasia patients can also be manifested as axillary lymph node hyperplasia, enlargement, and even pain; and malignant tumors occurring in the breast, it is easy to appear in the axillary lymph node metastasis, will also appear in the axillary hard lumps, as well as obvious pain manifestation, and even advanced patients will also be manifested as a fusion of the hard lumps, accompanied by local skin abnormalities; and the most common benign lesions is the axillary lumps, which is the most common benign lesions, which is the most common benign lesions. The most common benign lesion is the paratesticular breast, which belongs to a kind of congenital developmental abnormality, and some patients will be manifested as having nipples, then the paratesticular breast this kind of disease needs to choose the surgical excision if necessary.