If you find a lump under the armpit during breastfeeding and have symptoms of pain, consider an enlarged lymph node in the armpit. This is because mastitis is prone to occur during breastfeeding, especially in primiparous women who breastfeed inappropriately and are prone to this complication. The patient will also show breast pain, for swelling, accompanied by fever, the formation of inflammation, it is easy to appear secondary to the axillary lymph node enlargement, the patient will also show localized pain, laboratory tests will also find that the blood test is increased. In this case, timely anti-inflammatory treatment should be carried out, and also need to keep breast milk emptying, the affected side of the breast to stop breastfeeding, after active and effective treatment, the patient’s symptoms can also gradually improve. There are some patients who develop axillary parastomia, because after pregnancy or childbirth, it will be manifested as enlargement of parastomia, and also manifested as axillary mass, accompanied by painful symptoms.