Skin allergies can be applied to magnesium sulfate wet compresses, mainly play a dry damp astringent, clean scab treatment effect, which is mainly for the acute stage of dermatitis, such as the appearance of bright red color erythema, papules, papules, blisters, accompanied by vesicles, oozing, scabs and other manifestations, accompanied by a certain degree of itchiness, in the application of magnesium sulfate wet compresses in the course of the excessive scratching needs to be avoided. If the oozing decreases, the vesicles dry up and crust, it can be applied with zinc oxide oil or black bean distillate oil. During the treatment period, it is also necessary to avoid spicy and stimulating foods as well as seafood and other hair products.