A magic weapon to lock water: stratum corneum
The stratum corneum is the outermost layer of our skin (there is a layer of sebum film outside the stratum corneum, which is a part of the stratum corneum because it is very thin). It consists of 15-20 layers of dead skin cells and sebum membrane composed of sebum and sweat glands. Become the skin's first barrier against the outside world. Cuticle skin care has a great responsibility, not only to withstand the invasion of external bacteria, dust and rays, but also to protect the moisture in the skin.
Why can the stratum corneum bear such a heavy responsibility? One is because of its own tissue, that is, a barrier composed of dead cells, sebum and other substances, and the other is because it contains special keratin, which has a certain water absorption effect and is the main water-retaining layer of skin. Keratin is like a sponge on the surface of skin. If there is no cutin, the moisture of the skin can't be stored, and it is prone to problems such as dryness and fine lines. Skin with damaged stratum corneum is also easy to become sensitive skin.
Because cosmetics advertisements, such as "peeling dead skin", are easy to misunderstand the stratum corneum. In fact, the stratum corneum is not only garbage, but also a necessary protective layer for the human body. There is no stratum corneum at all, the skin has no defense, and it is easy to be invaded by the environment, not only lacking water, but also suffering from various skin diseases. Meanwhile. When the stratum corneum is too thick, it will also affect the permeability of the skin and make the skin dull. In this case, the stratum corneum can be properly helped to fall off.
Generally speaking, skin cell renewal takes 28 days, during which the old stratum corneum will fall off and a new stratum corneum will form. Even if nothing is done, the original stratum corneum will not remain on the face all the time. If you want to exfoliate, once a month is enough. If it is too much, it may damage the stratum corneum.
Sebum: a magic weapon to lock water
Sebum secretion is the self-locking mechanism of skin. When the sweat on the skin and the skin surface are mixed together, an emulsified acidic lipid film can be formed, which can inhibit the growth of bacteria and fungi, prevent the evaporation of water, increase the elasticity and smoothness of the skin, and prevent the skin from cracking. These are inseparable from sebum secretion.
No matter what skin type, it has certain sebum secretion ability. Oily skin is vigorous, dry and sensitive skin is not so vigorous, and the oil and water secreted are relatively balanced, which is an ideal neutral skin.
Excessive skin secretion will lead to skin problems such as oily skin and acne, so it is necessary to control oil properly. However, if the oil control is excessive, the skin loses the protection of oil, and it is easier to lose moisture. One of the major tasks of water lock is to regulate sebum secretion of the skin.
There are two ways to regulate sebum secretion: external use and internal use. For example, through proper cleaning, reduce facial oil; It is an external use method to increase facial oil and prevent excessive dryness by applying oily skin care products. By eating foods with different oil contents to regulate skin secretion, this is the internal method.
Water lock magic weapon 3: moisturizing cream
The main function of cream (emulsion) is to moisturize and lock water. I usually see all kinds of cream propaganda, claiming that my products contain hyaluronic acid, amino acids and collagen, and have many functions of whitening and anti-wrinkle. This is doubtful. Instead of trying it slowly with your own skin, it is better to choose a cream with better moisturizing effect and let it play a role in locking water. If you really need more functional skin care products, buy the essence. Ordinary cream is difficult to whiten and wrinkle.
Cream contains more oil and is suitable for dry and sensitive skin. The emulsion contains less oil and is suitable for oily and mixed skin. When choosing moisturizing skin care products, carefully look at the oil content in their descriptions and find the one that suits your skin.