The growth of granules around the nipple may be due to Montgomery’s nodule, sebaceous gland blockage, folliculitis and other reasons. 1. Montgomery’s nodule: it may be due to the ductal opening of Montgomery’s gland is higher than the skin and become, in the non-pregnant women is not obvious, with the pregnancy, estrogen and progesterone level rises, the development of sebaceous glands in the periphery of the areola increases, the opening is higher than the skin, so the formation of Montgomery’s nodule, the patient’s nipple will grow around the granular material. 2. Sebaceous gland blockage: If the breast is not washed for a long time, the sebaceous gland may secrete a large amount of material gathered to block the gland, which may lead to long granules around the nipple. 3. Folliculitis: mainly caused by bacterial infection and inflammation, red bumps centered on hair follicles, accompanied by local redness and swelling as well as pain and other symptoms. The granules around the nipple may also be caused by chestnut pimples, tumors, etc. It is recommended that the patient seek medical attention as soon as possible to clarify the cause of the disease.