Male nipples with hard lumps are often considered male breast development, often occurring in adolescence, with hard lumps within the nipples or enlarged mammary glands, it is recommended to do ultrasound examination, as follows: 1, male breast development: the cause needs to be found, it is best to check the gonadal hormones again to see if the estrogen is high or the ratio of androgen to estrogen is reduced, and also to observe whether the diet is reasonable, whether there is too much intake of supplements or certain drugs that cause an increase in estrogen. If there is an inappropriate situation to actively correct, the problem is not big. If the breast development is more obvious, estrogen antagonists can be used or consider surgery; 2. Sebaceous cysts, caused by the blockage of skin glands, may not be treated if there are no symptoms, but if they continue to grow larger, they can be surgically removed.