Allergic people should know the material of the mask before wearing it, avoid using masks with allergic ingredients, and avoid using counterfeit products. Pay attention to replace the mask in time when it is wet. If only mild local erythema, itching or tingling appears after wearing the mask, you can clean the skin with water. When blisters and erosions appear, you can use 3-4 layers of gauze soaked in cold boiled water to apply wet compresses 3 times a day for about 20 minutes each time, and take anti-allergy drugs under the guidance of a doctor when itching occurs. If there is no improvement or even aggravation within a week, it is recommended to go to the hospital for consultation and treatment by a skin specialist.