Lipoma, sebaceous adenoma, costochondritis, breast hyperplasia and other diseases are mostly considered. 1. Lipoma: a common benign tumor under the skin, caused by abnormal proliferation of fat cells, which will cause male chest nodules, most of which have no obvious symptoms. 2. Sebaceous adenoma: related to the abnormal proliferation of sebaceous gland tissues, belongs to benign lesions, will cause corresponding symptoms, part of the accompanying local inflammation will cause pain. 3. Costochondritis: the corresponding lesions will cause swelling and pain in the tissues around the costochondral bone, and the pain will be aggravated by pressure. 4. Breast hyperplasia: mainly related to the inactivation of estrogen, such as men with abnormal liver function, there will be local breast hyperplasia, i.e., palpable nodules in the chest. Male chest nodules can also be seen in other diseases, it is recommended that patients seek medical attention in time to avoid delaying the condition.