The causes of red dots on the inner wall of the urethra may include urethritis, genital herpes, warts and so on. 1. Urethritis: when gonococcus, chlamydia trachomatis and other invasions of the urethra, it is easy to cause inflammation, showing the symptoms of red dots on the inner wall, accompanied by stinging and itching, frequent urination and painful urination. 2. Genital herpes: genital herpes is a sexually transmitted disease, mainly due to the herpes simplex virus, when the onset of the urethra lining will appear red dots. 3. Condyloma acuminatum: This disease is usually caused by human papilloma virus infection, and common triggers include numerous sexual partners, immune problems, and unprotected sex. In the early stages of the disease, patients can also produce red dots on the inner wall of the urethra. There are many other causes of red dots on the inner wall of the urethra, so it is recommended to seek medical examination as soon as possible, improve the examination, clarify the cause and diagnosis, and standardize the treatment under the guidance of the doctor.