Red spots on the glans may be caused by sexual impurity, allergy and glansitis. 1. Sexual uncleanness: Multiple sexual partners or not paying attention to the cleanliness of the genitals during sexual intercourse, resulting in bacterial growth on the glans, may cause red spots on the glans. 2. Allergy: frequent use of irritating or chemical detergents to clean the glans, causing an allergic reaction, which may lead to glans red spots, itchy and so on. 3. glansitis: glansitis is caused by infection, trauma, physical and chemical stimulation and other factors, which will lead to inflammatory reaction in the glans area, and may be clinically manifested as red spots, redness, swelling and ulceration of the glans. If there is a red spot on the glans, it is recommended to go to the urology department for consultation and treatment under the guidance of the doctor after clarifying the cause of the disease.