The redness of the glans without other symptoms is considered to be related to foreign object friction stimulation, skin weakness, etc., and also considered to be related to the circumcision, glansitis, eczema, etc.. 1. Physiological factors: when the foreign body friction stimulation glans, local skin weakness, frequent sexual intercourse, etc., can cause some men glans redness, but no other symptoms. 2. Circumcision: For some patients with circumcision, it can be manifested as red glans, but there are no other symptoms. There are also some circumcised patients who have difficulty in urination, accompanied by purulent discharge and other symptoms. 3. Glans: the disease is related to pathogen infection, trauma, foreign body friction stimulation, etc. Some patients with mild glans may have red glans but no other symptoms. With the progress of the disease, patients with glans will gradually appear local itching, skin and mucous membrane edema, and even accompanied by oozing, bleeding and so on. 4. Eczema: the cause of the disease is not clear, may be related to genetics, immune abnormalities, hormone level changes. Patients with acute manifestations of erythema, edema, papules, etc., some patients may appear red glans but no other symptoms. Some eczema patients are also prone to itching, flaking, local lymph node swelling and other symptoms. It is recommended to observe the red glans without other symptoms, if accompanied by other uncomfortable symptoms, should consult a doctor in time. Daily attention to personal hygiene, try to wear cotton, loose underwear.