If you have an allergic reaction to a mask, you should immediately wash your face with water to clean the chemical residue of the mask. In addition, you can apply anti-allergic or anti-inflammatory ointments, such as Benadryl ointment and dexamethasone ointment, which have anti-allergic and anti-inflammatory effects. Furfuranate lotion can also be used. You can also take some oral anti-allergy medications at home, such as loratadine, cetirizine, and epinephrine, all of which have anti-allergy effects. But if the symptoms do not improve through the above treatment, you must go to the hospital to inject medication, usually anti-allergic can be intramuscular injection of Benadryl, in addition to intravenous injection of dexamethasone and other glucocorticoid drugs, also have anti-allergic, anti-inflammatory effect.