There are many reasons why the areola suddenly becomes larger, the specific analysis is as follows: 1, puberty development, in the period when the breast begins to develop nipple, areola will become larger, this is a normal physiological performance, this period need to give the girl good science and psychological work. 2, breast allergy, breast contact with poor quality underwear and creams lead to breast allergy, the areola will have swollen, painful feeling. It is necessary to stay away from allergic substances and take antihistamines for treatment. 3, pregnancy and lactation, during these two special periods due to changes in estrogen, will promote the secondary development of the breast so that the areola becomes larger, which is a normal phenomenon. 4, breast fibroids, enlarged tumors will be propped up areola, this disease requires surgery to remove the tumor in the preparation period.