There are many causes of bumps on testicles, such as scrotal eczema, testicular cysts, testicular tumors, etc., which can be treated by medication and surgery. 1. Scrotal eczema: Scrotal eczema can be caused by abnormal immune function of the body, infectious factors, genetic factors, environmental factors and so on. It can be manifested as pimples on the testicles, local dampness, itching, etc. It can be applied locally with miconazole nitrate cream as prescribed by the doctor. At the same time, pay attention to local hygiene, keep the scrotum area dry. 2. Testicular cysts: If the lumps grow under the skin of the scrotum, they may be testicular cysts, which can be caused by inflammation and other reasons. Surgical treatment should be chosen according to the patient’s specific situation. 3. Testicular tumor: if the lump grows under the skin of scrotum, it may be a testicular tumor, caused by tumor invasion. Patients who meet the indications of surgery can undergo surgical treatment, and those who cannot undergo surgery can be treated with radiotherapy and other methods. There are other reasons that can lead to the growth of lumps on the testicles, and it is recommended that such patients go to regular hospitals to clarify the causes and actively deal with them.