Today, there are more and more patients with cosmetic dermatosis, which affects the beauty of the face and causes stress and mental burden to women who love beauty, and affects the patients’ pursuit of their own exquisite life. In addition, many patients with cosmetic dermatoses do not recognize and value the disease correctly and do not receive timely treatment. Common cosmetic disorders of the face, such as acne, rosacea, hormone-dependent dermatitis, facial reoccurring dermatitis, seborrheic dermatitis, and chloasma. In hospital dermatology clinics, we often encounter patients like “my skin seems to be allergic”, “acne is always bad…”, “my skin tingles, reddens and itches when I use anything. “”I use hydrating masks every day, but my skin still breaks out!”” At this time, a variety of skin care information, beauty magazines, including skin doctors will definitely tell you: skin allergies, acne closed mouth, red itchy skin, breakouts, are the fault of the damaged skin barrier. Not only that, but all kinds of products on the market are claiming to repair skin damage and rebuild the skin barrier… Curious babies will ask: they all say they want to repair to repair, but almost no one ever says exactly what they want to repair? The skin barrier is the guardian of healthy and beautiful skin, and its good or bad determines the quality of the skin. The skin barrier is mainly composed of the sebaceous membrane and the stratum corneum. It mainly plays the role of keeping the skin moisture, preventing the evaporation of water in the body and resisting the invasion of foreign substances from outside. Excessive and frequent exfoliation and removal is tantamount to “demolishing” the skin’s natural barrier, which can easily cause dry, itchy, sensitive and inflamed skin. The sebum membrane is a mixture of sebum and sweat that covers the surface of our skin and is only 0.5 microns thick. Don’t look at how thin it is, but it plays an important role and can be considered as the body’s natural moisturizer by its own synthesis. The sebaceous film is the most important layer of skin water locking, which can effectively lock water; at the same time ta is made of sebum and water emulsification, which can effectively moisturize the skin; as the epidermal immune layer of the skin, the sebaceous film can also inhibit the growth of certain microorganisms, and has the role of anti-infection. The stratum corneum is a relatively simple structure consisting of multiple layers of keratinocytes and intercellular lipids. A healthy stratum corneum has a superb ability to retain water and does not dry out the skin even in an environment of 0 humidity. Elias PM, an American scholar, has proposed the famous brick wall doctrine, figuratively named “brick wall structure”. The stratum corneum is a “wall” of glial cells (bricks) and intercellular lipids (mortar), which forms a natural protective barrier for the skin. How bad is a damaged skin barrier? First of all, a healthy skin barrier must be a tightly connected keratinocyte, able to keep the skin hydrated in the changing environment of the seasons, to resist the invasion of foreign substances, and to look hydrated and delicate. If the “dirty stuff” touches the healthy skin barrier, it will automatically bounce away! If the sebaceous film becomes thin and the stratum corneum is damaged one day due to external or self-inflicted reasons, the skin’s moisture will start to run out in large quantities and external irritants will easily penetrate the stratum corneum, resulting in dry and cracked skin, allergies, redness, inflammation, stinging skin care products and other problems. So dry skin, sensitive skin also appeared… Skin barrier damage after a thousand holes How to repair the damaged skin barrier? A lot of things are like the love of the Supreme Being, waiting until after the loss to regret – and so is the skin barrier. When the skin barrier has been damaged, what should we do to repair it? 1. Choose skin care products that mimic normal sebum What is lacking to repair it. In short, we just need to know that to restore the barrier, the most important thing is to restore the lipid structure. The composition of lipids is ceramide, cholesterol and free fatty acids, of which ceramide is the most important and longest supplement, so in the selection of skin care products to select skin care products containing ceramide ingredients will certainly not be wrong ~ In addition, medical skin care products will have better results than ordinary skin care products. 2, correct cleansing After removing makeup to wash your face to crunch, only to feel clean? The big oil field with strong oil control, strong cleaning products to feel dry and comfortable? Don’t be easily fooled by your own feelings! In fact, this will wash away too much sebum film, leaving the skin in a degreased state and losing intercellular lipids that play a role in moisturizing. So don’t overdo it and be gentle with each cleansing process. It is best to avoid surfactants, alcohol, fragrances, synthetic preservatives, synthetic colors, dodecyl sulfates and other ingredients. 3. Keep your skin hydrated Skin hydration is exceptionally important for barrier repair, so doctors will tell you to moisturize, moisturize, moisturize. Whether it’s water or cream that you replenish at any time, make sure to keep your skin hydrated at all times. Of course, all the great sprays in the office are only temporary relief, so be sure not to forget to replenish your cream or gel. For dry, very dry skin, the outermost layer of the oil protective film is essential. 4, do not frequently exfoliate In fact, many skin problems are often tossed by their own bad, we think the “serious maintenance” often to the skin barrier to bring heavy damage, such as frequent use of exfoliating products, is representative of the behavior. In the future, do not be obsessed with exfoliation after the smooth feeling, please reduce the frequency of exfoliation, and avoid the use of coarse grain exfoliation cream and irritating exfoliation tools, to maintain a good healthy stratum corneum will be good skin. In addition, maintaining skin ph (note: our skin is weakly acidic), getting a good night’s sleep, reducing UV exposure, relieving mental stress, and staying away from processed snacks are also good ways to strengthen the skin barrier~.