There are many reasons for small bumps inside the areola during breastfeeding, as follows: 1. Montserrat nodes, which are normal physiological structures that are normally closed and open during pregnancy and breastfeeding. 2. Breast lymph nodes, which are painfully enlarged when inflammation is evident, but have smooth, movable edges, can be removed by infusion of anti-inflammatory fluids or surgery. In case of cancer metastasis leading to swollen lymph nodes, high vigilance is needed and active anti-cancer treatment is required.3. Breast enlargement, nodes are visible in the breast of patients with breast enlargement, which can move, have clear borders, and are not adherent. There will be pain during menstruation and the pain will disappear after the menstruation period. If the pain is obvious, you can take prolotherapy pills to regulate it. 4.Mammary fibroids, the tumor usually does not feel, but will increase rapidly during breastfeeding, affecting life and beauty, and need hospitalization.