Red patches on the glans is glansitis, early glans has scattered small red dots, as the inflammation increases, on the glans becomes plaque-like, which is caused by the increase in inflammation, not timely treatment. It is recommended that when there are red patches on the glans, the foreskin must be turned over and the glans effectively cleaned and kept dry to prevent further aggravation of the infection. You can use 1:5000 potassium permanganate dilution for soaking, and it is recommended to apply erythromycin and gentamycin eye ointment locally, which are weakly irritating to the glans and have anti-inflammatory functions. 3-5 days later the color of the plaque will gradually fade and return to normal.