First, the discovery of the excellent efficacy of fruit acids Fruit acids (referred to as AHA), as the name suggests, is a variety of organic acids extracted from fruits, is present in a variety of natural fruits or yogurt in the effective ingredients. The use of fruit acids can be traced back to the ancient Egyptian and Roman times, but it was not until the 70’s that the cosmetic effects on the skin were discovered by Dr. Scott in the United States and Dr. Yu Ruijin, a Chinese-American. Due to the excellent effects of fruit acids, Time Magazine even listed fruit acids as one of the top ten products in 1993. Today, fruit acids are used by dermatologists around the world as a complementary treatment and indispensable tool for home maintenance. Second, the role of fruit acids The role of fruit acids can be viewed from the epidermis and dermis respectively: fruit acids act on the epidermis, reduce the polymerization of keratinocytes, accelerating the aging keratinocytes off, enhance the speed of metabolism of the epithelial cells, prompting the skin to renew, but also make the epithelial cells more neatly arranged, the stratum corneum then became smooth and detailed. At the same time, fruit acids can also make the keratinized plugs around the pores easy to fall off, and unclog the follicular canal, effectively preventing pore blockage. When fruit acids work on dermal flakes, they stimulate the growth and rearrangement of hyaluronic acid, mucopolysaccharides, collagen and elastin fibers, which increases the water content of the skin, making it firm and elastic, and reducing the appearance of fine lines and wrinkles. The main function of fruit acids on the skin is to reduce acne and wrinkles. Low concentration of fruit acids can stretch the skin’s fine wrinkles, and can enhance the skin’s whistle function, increase the secretion of the follicular glands, to achieve the purpose of treating acne; medium concentration of fruit acids can improve the roughness and dryness of the skin and chapped, prompting the expansion of the capillaries, has a good effect of moisturizing; high concentration of fruit acids can make the epidermis and the dermis detached to eliminate the pigmentation of the face, has a strong peeling effect, to play a chemical The role of chemical peeling. Higher concentrations of fruit acids need to be applied under the guidance of a professional physician. Third, the use of fruit acid 1, from the low concentration (1-4%) to start trying. 2, if your skin is seriously damaged, such as sunburn or allergies, etc., need to give the skin a repair process, you can continue to use three days of soothing moisturizing mask, the skin will be adjusted to a more healthy state. 3, in the beginning of the use of 3-7 days, some people will appear peeling, oil and other serious phenomena, do not worry, and so the skin will adapt to make the skin’s water storage capacity stronger. 4, the use of fruit acids must be strengthened during the attention of the sun. 5, the use of fruit acid skin care, should not use other exfoliating products, can not rub the skin, but also to avoid the use of A acid, salicylic acid and other acidic ingredients of cosmetics. 6, wash your face, use lotion for 20 minutes, and then use fruit acid products. 7, first wipe the T-zone and then extend to the face, from the thick cuticle to the thin places, eyes and lips around the last. 8.You can use lotion to neutralize fruit acid products that are too concentrated. 9, according to the need to use once a week, there are serious allergies in the skin and in the dermatological treatment of patients should not be used. 10, winter and summer is the best time to use fruit acids. Fourth, the use of fruit acid precautions 1, fruit acid itself can be exfoliated, do not need to use exfoliating products, do not steam the face, do not over-massage, so as to avoid skin injuries. Wash your face as gently as possible to avoid stimulating the skin. High concentration of fruit acids and vitamin A acid, vitamin C are PH pH value of the lower products, not recommended for use at the same time. 2, the use of fruit acids, the skin because of the thin stratum corneum, by the possibility of some external stimuli more sensitive, such as sun exposure, wind and some of the alcohol, exfoliating ingredients of cosmetics and maintenance products. Adding some protective measures, such as using moisturizers and restorative ointments, is necessary. Although fruit acids, unlike retinoids, are not photosensitive and can be used both in the morning and at night, it is easy to get a tan or sunburn if you don’t wear sunscreen after exfoliating. So when rubbing fruit acids during the day must pay attention to sun protection, try not to let the skin be stimulated by the sun. 3, the skin if there is stinging, redness, itching, peeling and other uncomfortable symptoms, you should immediately stop using fruit acids, cold water can be used on the face for 10-20 minutes, to be calmed, and the use of repair cream to increase the moisturizing maintenance, when serious, you can go to the hospital to let the doctor to deal with repair ointment. When used again, or to start from a low concentration, and then slowly increase the concentration and the number of times to use, through a period of time will be gradually adapted because of increased tolerance. 4, skin sensitivity can be done before the use of patch test, or applied to the inside of the arm, no irritation reaction before considering the use. Avoid mucous membranes and around the eyes when using, and reduce the amount when using near the mouth and lips because the skin is weak. Although fruit acids are widely used, and there are many products on the market, but all of you who are eager to seek beauty, in addition to a full understanding of fruit acids, but also to turn to a professional doctor, so that the experts for you to create the most perfect program, this is the wisdom of the people should be cognizant of ah.