There are red spots on the glans after sex, and the possible clinical causes are circumcision and glansitis, localized skin injuries, viral infections, and so on. 1. Inflammation of the foreskin and glans: this condition is usually associated with the presence of vaginal inflammation in the partner, especially bacterial vaginitis, mycosis vaginalis and other diseases, the glans will be infected and local skin lesions appear after sex. 2. Localized skin damage: If both men and women are not experienced in sex life or too rough, it may cause localized skin damage to the external genitalia, which can be manifested as red spots on the glans after sex, and this situation requires appropriate suspension of sexual behavior to avoid reoccurring injuries. 3. Viral infection: If the other party to the sex life is infected with related viruses, such as herpes virus, it may be transmitted to the sexual partner, when the symptoms of infection, the clinical manifestations may be itching, skin lesions, red spots and so on. There are many reasons for red spots on the glans after sex, and it is recommended to go to a regular hospital for consultation and treatment.