Talk about the importance of moisturizing in the repair of skin barrier function damage I. The importance of skin barrier function. The skin is an important protective organ of the human body, and intact skin is a barrier between the body and the external environment, which can have the functions of preventing water loss, sun protection, and preventing viruses and bacteria harmful microorganisms from attacking. 1. Brick wall structure of the skin: The natural barrier function of the skin is composed of the brick wall structure it has. The cells of the epidermal stratum corneum are like bricks. The “lipids and natural moisturizing factors” between the cells of the stratum corneum are like mortar, which binds the cells of the stratum corneum together. At the same time, there is a sebaceous membrane on the surface of the skin, which is composed of oil, natural moisturizing factor and water. The brick wall structure and the sebaceous membrane together form a natural skin protection barrier. 2.Why does skin barrier function damage occur? Excessive skin cleaning, sunburn or skin diseases can lead to the destruction of the skin brick wall structure, increased transdermal water loss (TEWL), and symptoms such as dry skin, thickening, cracking, flaking, redness, sensitivity, itching, and thinning of the stratum corneum. Common diseases include senile pruritus, ichthyosis, atopic dermatitis, psoriasis, eczema, facial acne, hormone dependent dermatitis, rosacea, seborrheic dermatitis, sensitive skin, etc. Second, repair the skin barrier function, moisturizers play an important role. The main component of the skin is water. Damaged skin has increased transcutaneous water loss, resulting in dryness and cracking, among other symptoms. This requires the use of a good moisturizer to maintain moisture to maintain the normal physiological function of the skin. Common moisturizers often contain allantoin, hyaluronic acid, collagen, vitamin e, squalane, ceramides, chitosan, etc. The moisturizers containing various ingredients have a complementary effect on the “sebaceous membrane”, while the various moisturizing factors and lipids in the moisturizers can penetrate into the epidermal keratinocytes, so that the damaged skin barrier can be gradually repaired. Therefore, moisturizers are very important for repairing the damage of skin barrier function. Of course, the choice of moisturizer also needs to be selected according to individual skin conditions, and targeted and individualized treatment is required.