Fruit acids are hydroxy acids extracted from fruits, sugar cane, yogurt, etc. Hydroxy acids have two functions: moisturizing and anti-keratinization. The mechanism of action of fruit acids is to reduce the adhesion of keratin-forming cells, accelerate the shedding and renewal of epidermal cells, and stimulate the production of collagen and mucopolysaccharide in the dermis to effectively improve various skin problems. Fruit acid skin resurfacing (skin care) is a new trend in recent years. Fruit acids are widely used in dermatology for the treatment of acne, rosacea, ichthyosis, keratosis, melasma and other hyperpigmentation diseases, and also have good effects on some superficial dark spots, acne, precipitated pigments, fine wrinkles, etc.