Exfoliation has a protective effect on the skin and is not recommended to be removed frequently, usually it can be done once in 1-3 months. The main purpose of exfoliation is to ensure the elasticity and color of the skin, mainly using some physical means or the corrosive effect of certain drugs to remove excessive keratin. Normal skin epidermal metabolic cycle is about 28 days, generally 2-3 cycles to make the keratin again to restore the original skin thickness, if exfoliation is too frequent, may stimulate the normal skin, causing erythema, burning and other sensitive symptoms, the serious may also appear irritating dermatitis symptoms, triggered by the local epidermal pain, ulceration. It is recommended to apply a layer of moisturizer on the skin surface before exfoliation, which can form a protective film on the outside of the skin, which not only improves the effect of exfoliation, but also protects the skin and reduces the irritation of drugs on the skin.