The hard lump found in the areola during breastfeeding is considered to be caused by milk stagnation, which is related to local extrusion and blockage of the milk ducts. It is recommended to go to a regular hospital in time to avoid the symptoms of acute mastitis due to milk stagnation and bacterial invasion. The symptoms will be relieved soon after the ducts are opened, and local hot compresses can be applied to promote the dissipation of inflammation. If necessary, you need to go to the hospital for an ultrasound examination to determine the specific nature of the hard lump. If you have symptoms of acute mastitis infection, you need to treat it with antibiotics and other medications in a timely manner, and if necessary, you can perform puncture and drainage surgery for abscesses.