The common causes of axillary with small granules are mainly the following: a. Reactive hyperplasia of axillary lymph nodes. Mostly seen in female patients with breast hyperplasia, the axilla can be accompanied by the enlargement of lymph nodes, which is manifested as small granule-like changes. In most patients, after the symptoms of breast hyperplasia are controlled, the axillary lymph nodes can gradually subside and will not cause serious complications. Secondly, the blockage of underarm pores can cause localized epidermoid cysts, which will be combined with pain symptoms once accompanied by infection. It is recommended that patients have small granular sebaceous cysts surgically removed as soon as possible to avoid painful symptoms. Third, patients with malignant breast tumor may have cancerous granular nodules when the tumor cells invade into the armpit. At this time, the patient needs to have radical treatment of breast cancer plus axillary lymph node dissection as soon as possible to prolong the life as much as possible.