Soap bases are not toxic and may cause skin damage with regular use. Soap base is a common surfactant, or detergent. The cleaning ability is ideal, but it can also cause some damage to the skin. Soap cleansing ingredients usually consist of fatty acids + sodium hydroxide, i.e. oil + base. Heavy use of high-frequency soap-based formulations of cleansing products will deprive the skin surface of needed oils while cleansing the skin surface, thus affecting the skin’s resistance to irritation. At the same time, soap base will invariably scratch the stratum corneum, affecting the order and density of keratin-forming cells, making the skin texture messy and affecting the skin’s touch and appearance. Soap base must be careful not to use for a long time, will harm the stratum corneum, such as has been the loss should go to the hospital dermatology department for treatment.