A small red dot on the glans may be caused by glansitis, purpura, external stimulation, allergy and other reasons. 1. glansitis: bacterial, trichomonas, candida and other pathogenic bacteria infection, resulting in inflammatory reaction of the glans, may cause a small red dot on the glans. 2. Purpura: allergic purpura idiopathic thrombocytopenic purpura, can also cause subcutaneous hemorrhagic spots caused by the glans grew a small red dot. 3. external stimulation: for example, the glans is extruded by external forces, frequent masturbation, excessive sexual life and other reasons, may also lead to the glans grow a small red dot. 4. Allergy: For example, if the glans comes into contact with external sensitizers, or takes certain foods or medicines, resulting in an allergic reaction, it may also be manifested as a small red dot on the glans. A small red dot on the glans, there may be other reasons, you need to go to the hospital in a timely manner to check the cause of the disease and follow the doctor’s instructions for treatment.