The most common type of lump in the armpit is the paratesticular breast, and the most effective treatment is to choose surgery, which is also a very common benign disease, and can be surgically removed under local anesthesia. If there is a gradual increase in size within a short period of time, with obvious symptoms of pain, it is not excluded that the paratesticular breasts are malignant, and if necessary, they need to be enlarged and the axillary lymph nodes need to be cleared. In some cases, there are benign lesions under the skin of the axilla, mainly lipomas or fibromas. The main method of removal is also to choose surgery, usually should pay attention to regular review, pay attention to local hygiene. There are also patients who suffer from simple lymph node enlargement in the axilla. Some patients are due to muscle tissue strain after trauma or inflammatory changes in the mammary glands, resulting in hyperplasia and enlargement of axillary lymph nodes, which can be treated by intravenous anti-infection therapy, which can make the enlarged lymph nodes gradually decrease and subside.