There are many reasons for a lump inside the male areola, such as intramammary papilloma, gynecomastia, sebaceous cysts and so on. 1. Intraductal papilloma: a lump inside male areola may belong to intraductal papilloma, which may show small localized lumps, and need to be combined with lactoscopy and breast ultrasound to make a clear diagnosis, which may be related to daily life style, heredity, improper diet, and acquired environmental factors. 2. Gynecomastia: Gynecomastia is common in adolescence and old age, which can show unilateral or bilateral breast enlargement, or discoid mass under areola, thus it will lead to the phenomenon of a lump inside male areola. 3. Sebaceous cysts: a lump inside the male areola may belong to sebaceous cysts, which may show that there is a slowly increasing confined swelling in the areola, and the volume is usually not large. At the same time, breast hyperplasia, breast cancer, breast fibroadenoma, chest wall disease can also be seen in the case of lumps inside the breast, need to be carefully identified. There are many reasons why there is a lump inside the male areola, it is recommended to go to the hospital in time to improve the examination, follow the doctor’s instructions to take standardized treatment, do not ignore the symptoms, take it lightly.