1.What is the skin barrier? The outermost layer of the skin is called the stratum corneum, which is composed of 20 layers of flat, interwoven keratinocytes. The keratinocytes are as tough as “bricks”, and there are lipids like “mortar” between them to connect the keratinocytes closely with each other, forming a “brick wall structure”. There is also a protective film (hydrolipidic film) composed of sweat and sebum on its surface, which together form the barrier of the skin. The skin barrier can lock the skin moisture and oil, and resist the invasion of various skin surface germs, which plays a very important protective role for human health. 2.Dermatological diseases and skin barrier There are various skin diseases, and many of them tend to recur, but it is difficult to find the specific cause. The common skin redness, itchiness, dryness and other “skin allergy” performance, it is difficult to find the specific “allergy” source. However, these skin diseases have a common cause – “damaged skin barrier”, that is, the skin surface loses its normal protective function and there is a loss of skin moisture, resulting in dry, flaky or itchy skin; at the same time, the surface of the skin is easily damaged. At the same time, germs on the skin surface can easily enter the skin through the damaged skin barrier, which can further trigger skin inflammation. Therefore, a damaged skin barrier is not only a manifestation of many skin diseases, but also may be an important reason why skin diseases tend to recur. Skin care products and skin barrier In the treatment of skin diseases, doctors not only use medications, but also skin care products that can repair the skin barrier function, that is, to supplement the “water-lipid film” on the surface of the skin and the “mortar” between the cells by moisturizing skin care products, so as to The “brick wall structure” of the skin surface should be reinforced. 3.Basic ingredients of medical skin care products Moisturizing skin care products to repair the skin barrier should have the following three basic ingredients: wet agent ingredients including glycerin, urea, etc., which can absorb water from the environment and replenish the water lost from the stratum corneum. Sealant ingredients such as petroleum jelly and avocado oil can form a thin hydrophobic oil film on the skin surface, which has the effect of reinforcing the skin barrier. Adding the same or similar “bionic” ingredients with epidermis and dermis has the effect of repairing the skin barrier, such as natural moisturizing factor, cymbopogon oil, ceramide, hyaluronic acid, etc. 4.What are medical skin care products? The skin care products used by doctors to assist in the treatment of skin diseases can be referred to as “medical skin care products”, which, compared with ordinary skin care products, require the following three characteristics: 1) higher safety: more than ordinary skin care products emphasize the formulation of streamlined, strictly screened raw materials, do not contain or minimize the substances that can easily damage the skin or cause skin allergies, such as pigments, fragrances, preservatives, irritants The product should be free from or contain as little as possible skin-damaging or skin-allergenic substances such as colorants, fragrances, preservatives, irritating surfactants, and clinical safety assessment of raw materials. 2) Clear efficacy: The mechanism of action of the main product components of moisturizing and skin barrier repair skin care products is clear and has been confirmed by scientific experimental research. 3) Clinical validation in multiple hospitals: Clinical studies conducted by dermatology departments in multiple hospitals before marketing to verify the clinical efficacy and safety of skin care products. From the above 3 features, it is clear that medical skin care products themselves do not have any toxic side effects on the skin and can be used for a long time as appropriate to reduce or alleviate recurrent skin diseases. 5, the use of methods and instructions face: should consider using a mild non-stimulating cleanser, and in the cleansing of the face after the use of moisturizing water, and then use medical moisturizing skin care products, while going out to use sunscreen appliances, and external mild non-stimulating sunscreen, but in the acute phase of dermatitis, need to be careful with sunscreen. Torso and extremities: Clean with water or mild non-irritating body wash only and then apply medical moisturizing skin care products. If you need to use topical medication, you can apply moisturizing skin care products to increase the hydration level of the skin first, and then apply medication after 30 minutes or so. Types of moisturizing skin care products: commonly used as creams, can also be gels, water or masks, etc. How to choose the type in clinical practice should be based on the symptoms of the skin to make a decision. Medical skin care products are not drugs and are generally not sold in pharmacies within hospitals (except for moisturizers with device approvals), but are purchased in pharmacies, supermarkets or shopping malls.