Long-term redness on the male coronal edge may be caused by glansitis, circumcision, phimosis and other reasons. 1. glansitis: there can be symptoms such as redness and swelling of the coronal groove, redness and pain of the glans, and there can be secretions oozing out of the phenomenon, which is mostly caused by bacterial infection. 2. circumcision: mostly due to the dirt hidden in the coronary groove, cleaning is not in place and the bacterial growth, bacterial growth can be infectious phenomenon, so there can be symptoms such as redness, swelling and pain of the foreskin. 3. circumcision: mostly due to the long foreskin, circumcision leads to the coronal groove is always wrapped by the foreskin, foreskin scale stimulation, chronic lack of oxygen can appear in the coronal groove on the side of the phenomenon of long-term redness. There may be other reasons for men to have long-term redness on the side of the crown, and it is recommended to consult a doctor in time. Drugs need to follow the doctor’s instructions reasonable application.