If the erythema is caused by bacterial infection and the erythema appears on the glans or external genitalia, it is recommended to apply a little topical Bactrim ointment, 3 times/day, for one week for treatment. If the local erythema caused by fungal infection is diagnosed, it is recommended to use sodium bicarbonate solution for local external washing, after the external washing is clean and dry, apply miconazole ointment or clotrimazole ointment a little, 3 times/day, one week of continuous external application for treatment. Third, if the trichomonas infection appears erythematous phenomenon, it is recommended to use metronidazole solution for local external washing, and can also use metronidazole gel for local external application. Each time a small amount of external application, external application 3 times / day, continuous use for a week, observe the improvement of symptoms. Fourth, if it is an allergic reaction to local erythema, after the diagnosis is confirmed, it is recommended to apply a little topical mometasone furoate, 3 times / day, 3-5 days of continuous topical application. Oral anti-allergic drug treatment, such as Desloratadine dispersible tablets, 1 tablet / time, 1 time / day, continuous oral for a week.