In non-pregnant cases, the areola is locally smooth and no nodules appear. It is only after pregnancy that the sebaceous glands on the areola become enlarged and form small scattered nodules under the influence of hormonal levels, which are called Montgomery’s nodules, that is to say, Montgomery’s nodules appear because of pregnancy. The main function of the nodules is to secrete lubricant, which ensures that the areola and nipples are moist and not dry, and serves this physiological function. It is also recommended to keep the breasts clean after pregnancy and to wash them with hot water every day to avoid local inflammatory reactions. In addition, if there is nipple invagination, it is recommended to apply hot compresses and pull the nipple in time to correct this invagination during pregnancy.