Testis refers to the scrotum, scrotum with blood red granules but not painful and itchy may be thrombocytopenic purpura, syphilis and other diseases, need to take medication for the cause of the disease, surgical treatment. 1. Thrombocytopenic purpura: the main symptom is petechiae on the skin or mucous membranes, which can be manifested as blood red grains in the scrotum but not painful and itchy. Patients need to comply with medical advice to use prednisone, dexamethasone and other glucocorticoids, as well as gammaglobulin and other immunoglobulins. For refractory patients, immunosuppressants such as cyclosporine and a range of medications such as rituximab are prescribed. For patients who have failed drug treatment or have serious bleeding and other serious conditions, surgical treatment such as splenectomy should be considered. 2. Syphilis: Typical symptoms include a syphilis rash, indicating stage II syphilis, which is usually non-itchy and painless. Patients need to use antibiotics such as benzylpenicillin or procaine penicillin G as prescribed by the doctor, and if they are allergic to penicillin, they can use antibiotics such as ceftriaxone and doxycycline as prescribed by the doctor. When there are blood red grains in the scrotum but no pain or itching, you need to go to the hospital in time, and cooperate with the doctor to actively treat the original disease.