First of all, brush acid should know the endurance of his skin. This is not recommended if sensitive muscles are involved. Acid a is usually used. Acid A or salicylic acid, no matter which kind of acid, has a * * * similarity, which can accelerate the exfoliation of keratin, eliminate closed acne on the skin, reduce acne on the face and make the skin smoother. It should be noted that it should not be used frequently. These skin care products are more or less irritating. Brush acid is a phased effect, so be patient and stick to it for a period of time. Besides, salicylic acid can improve the skin compared with other substances.
Several common acids
tartaric acid
Water-soluble acid (almond acid is the only fat-soluble fruit acid, which has the dual functions of fruit acid and salicylic acid) has the main functions of promoting the metabolic growth of skin cells, removing old and waste keratin and promoting the metabolism of melanin, thus brightening skin tone, improving uneven skin tone and keeping skin delicate and smooth. Because of its moisturizing ability, it is more suitable for dry skin. More than 20% of high-concentration fruit acid must be found by a dermatologist.
Advantages: 1 Compared with other acids, fruit acid is mild. The first choice for beginners in brush acid. 2. Glycolic acid, lactic acid, almond acid and lactobionic acid. They all belong to a large family of fruit acids, so there is a lot of choice. The degree of gentleness increases from left to right, which means that lactobionic acid is the mildest and glycolic acid is more irritating.
Disadvantages: 1 Compared with other acids, the blackhead sealing effect is slow. 2. The effect on inflammatory acne is not enough.
salicylic acid
Fat-soluble acid, with strong permeability, can penetrate into pores to dissolve oil angle plugs, and has a good therapeutic effect on blackheads, closed mouths and acne. But also has certain oil control ability, which can reduce sebum overflow and acne growth. So it is more suitable for oily skin. The addition concentration in skin care products should not be higher than 2%.
Advantages: 1 The effect is more comprehensive and it is the savior of blackheads and acne. 2. It has a two-way regulating effect on skin horniness, except for removing dead horniness; Long-term use can also increase skin thickness, improve skin barrier function and promote collagen regeneration. 3. It can also diminish inflammation and sterilize, and has a certain anti-inflammatory effect on acne.
Disadvantages: 1 Dry skin is not suitable, which will aggravate dry skin. 2. The irritation is slightly stronger than that of fruit acid, so it needs to be hydrated and moisturized.
Nonane diacid
Rhododendron acid, oil control, anti-inflammatory, sterilization, improving abnormal mouth corner of hair follicle, has a good effect on acne; At the same time, it can inhibit the production of melanin, thus achieving the effect of whitening and lightening spots, and also has a certain desalination effect on acne marks.
Advantages: 1 Azelaic acid has a strong therapeutic effect on acne. 2. At the same time, it can prevent and fade black acne marks.
Disadvantages: 1 Poor solubility and poor skin feel. 2. Azelaic acid with the concentration of 15-20% can remove acne and improve closed mouth, light spots and acne marks, but it may cause discomfort such as burning and itching when used, so it is not suitable for beginners.
retinoic acid
It can dredge pores, inhibit skin oil secretion, penetrate deep into skin and kill acne bacteria. It has a good effect on improving abnormal mouth corner of hair follicle, and can treat goose skin, closed mouth and acne. It is a prescription drug and cannot be added to skin care products.
Advantages: 1 It has a lasting therapeutic effect on acne, and rarely recurs after cure. The low concentration of 2.0.025% will have a good effect, which is faster and more direct than other acids.
Disadvantages: 1 At the initial stage of use, it will be accompanied by severe dryness and desquamation, which will be gradually relieved after strengthening moisturizing and sun protection. 2. It is a prescription drug, and you need to consult a professional doctor before using it. 3. It has strong photosensitivity. You need to draw in the dark before going to bed. Can't be widely used. Do not use it during pregnancy, pregnancy and lactation, and it has definite teratogenic effect.