Red patches on the glans, indicating that the glans has been inflamed for a long time, long-term chronic inflammatory stimulation or the foreskin is too long, not timely cleaning, resulting in inflammation on the glans, and the increase in inflammation will form large red patches. In this case, it is recommended to clean the foreskin every day, and the foreskin is turned upward to expose the glans and keep it dry. You can apply erythromycin ointment or gentamycin ointment locally, and through this treatment, the red patches will gradually decrease. Through about two weeks of treatment, the plaque may gradually disappear. It is recommended to pay attention to hygiene in general to avoid the occurrence of circumcision and glansitis.