A red pimple on the glans is recommended to go to the hospital for relevant examinations to clarify the cause of the disease and then to deal with it symptomatically. First, if the examination is confirmed to be caused by allergies, it is recommended to apply local topical mometasone furoate ointment a little 3 times / day, 3-5 days of continuous external application, oral diclaretin dispersible tablets 1 tablet / time, 1 time / day, a week of continuous oral observation of symptoms disappear. Second, if suffering from glansitis, caused by bacterial infection, it is recommended to apply topical Bactrim ointment or erythromycin ointment a little 3 times / day, continuous external application for a week to observe whether the disappearance. Thirdly, if it is caused by fungal infection, it is recommended to apply miconazole ointment a little 3 times/day for a week and use sodium bicarbonate solution for local cleaning to observe whether the symptoms disappear. Fourth, if it is caused by trichomonas infection, it is recommended to apply interferon gel a little 3 times/day for a week, and use metronidazole solution for local cleaning, and observe whether the symptoms improve.