It is also known as chemical peel, which is a procedure that destroys the skin at a certain depth through chemical reagents, and allows the skin tissue at the corresponding level to be repaired with the help of the body’s own repair and self-shaping ability, in order to adjust the skin quality and restore the normal appearance of the skin. Chemical peels can be divided into 2 types according to the depth of action: ① superficial peels: destroy the epidermis and reach the papillary layer of the dermis; ② middle peels: destroy the epidermis and superficial layer of the dermis and reach the superficial layer of the dermal reticular layer; Indications: superficial peels are suitable for epidermal lesions such as seborrheic keratosis, solar keratosis, freckles, and fine wrinkles formed by physiological aging. Intermediate peels can address epidermal and some dermal lesions such as pigmentation, wrinkles and aging and more superficial scarring involving the dermis.