Erythromycin ointment can cure redness and swelling of the crown. It is only for bacterial infections and should not be used if there is a fungal or trichomonas infection. Coronary inguinal redness and swelling is because there is circumcision and glansitis. The coronal sulcus is the part connecting the foreskin and the glans, which is infected by urine, dirt and oil secretion for a long time, and the infection leads to the redness and swelling of the coronal sulcus. If it is a bacterial infection, you can use erythromycin ointment for local application, which can have a therapeutic effect. If it is a fungal infection erythromycin does not exist to treat, need to use miconazole and other antifungal drugs for treatment, if it is trichomonas infection using erythromycin is also no effect, you can use potassium permanganate solution for local immersion. If there is a coronary erythema, you should go to the regular hospital in time, the specific drugs need to be used under the guidance of a professional doctor, so as not to cause adverse reactions.