Eating salt is mainly sodium chloride, it is recommended not to use this salt to wash the face, because the concentration is not good control, if the salt is too large, after using it to directly contact the local skin will damage the stratum corneum, there is a certain corrosive effect, and even irritation of the skin, so it is recommended not to do so. Normally, if you want to make the stratum corneum more whitening, it is recommended to use oral vitamin C or glutathione, choose to use collagen mask externally, is also a good way to whiten. However, it is not recommended to choose irritating substances directly touching the local skin, so as not to form irritant dermatitis, erythema, itching and other symptoms, serious cases may even appear flushing, swelling performance. Therefore, it is recommended to be careful and not to use it randomly.