Infant red bottom, also known as diaper dermatitis, is mainly due to an allergic reaction following urine irritation. There may also be an allergic reaction due to diaper allergy. In treatment, erythromycin can be applied as it can have an antibacterial and anti-inflammatory therapeutic effect. Usually the rash is bright red in color or has breakouts or vesicles application can achieve some effect. However, treatment with this drug alone is not possible. It is necessary to take oral anti-allergy drug loratadine syrup, or desloratadine dry suspension. If the effect is not satisfactory, you can also add compound glycopyrrolate tablets for treatment, and in the area where the erythema appears, you can also apply dextran ointment for a short time to strengthen the anti-inflammatory immunosuppressive strength.