There are many possible factors for male nipples to have raised meat grains, such as abnormal secretion of sex hormones, sebaceous cysts, pimples formed by nipple allergy, acne, and so on. 1. Abnormal secretion of sex hormones: When developing, a large amount of estrogen is secreted or individual nipples are more sensitive to estrogen, which leads to the development of male nipple bulge. It is recommended that androgen-containing medicines can be taken under the guidance of a doctor and a two-pronged approach of balancing sex hormones with dietary therapy can be used. 2. Sebaceous cysts: If you don’t take good care of your nipples when you clean them, the sebaceous glands will produce too much secretion, which will lead to blockage or even cysts, so it is recommended that you do a good job of cleaning your nipples and protect your private parts. 3. Pimples formed by nipple allergy: The fabrics of the clothes that directly touch the nipples are too poor or too hard to rub the nipples excessively, or contact with low-quality body lotion, resulting in nipple allergy and the formation of pimples. 4. Pimples: excessive nipple secretion, sebaceous glands can not be normal excretion and thus caused by dermatitis. In addition, male nipple bulge a meatball may also be breast tumor, chest wall disease and other causes, it is recommended to timely consult a doctor to clarify the specific causes, follow the doctor’s instructions for treatment.