The common causes of axillary nodules are as follows: 1, axillary growth of body surface masses: such as sebaceous cysts, lipomas, fibroids, etc., need to go to the hospital to check the ultrasound for clarification. If it is a sebaceous cyst, it needs to be surgically removed as soon as possible to prevent redness, swelling and rupture; 2. Lymph node enlargement: there are many causes, such as bacterial infection, viral infection, tuberculosis infection, autoimmune system diseases, blood system diseases, allergic factors, and even lymph node metastasis of malignant tumors, which requires further improvement of relevant examinations, such as color ultrasound, and lymph node puncture biopsy or excision biopsy The nature of parametrial hyperplasia: common in women during pregnancy and postpartum, you can check the ultrasound for clarification, if the disease, do not worry too much, regular review can be.