When replacing other brands of masks in your daily life, you should first do a test to see if you are allergic. You can unwrap the mask to take out the mask liquid, and then applied to the skin behind the ear, that is, the skin around the earlobe slightly recessed, stay 24 hours to see if there is a skin redness, itchy feeling, if there is such a feeling, that is, some of the ingredients of the kind of mask has an allergic reaction, it is not recommended to use. Or in the inner forearm skin, with a clean gauze mask liquid poured on it, about the size of a square centimeter cut, and then with transparent adhesive tape on, stay 48 hours to remove, observe the skin there is no redness, itching, as well as the phenomenon of pimples, blisters, if there is no is not allergic to, can be used.