The skin covers the surface of the human body and is the natural coat of the body. The outermost layer of the skin is the stratum corneum. The stratum corneum has a layer of sebaceous membrane. The stratum corneum plays an important role in the integrity of the skin barrier function. Sebum membrane is a translucent milky film formed by the emulsification of sebum, sweat and epidermal cell secretion. Free fatty acids, lactate, urea and uric acid in the sebum membrane are natural moisturizing factors to moisturize the skin.
In winter, the climate is cold and dry. Sebum and sweat glands secreted by human sebaceous glands and sweat glands are reduced and sebum membranes are significantly reduced. Makes the human skin dry and rough, even the epidermis off, so that the intradermal nerve endings are more susceptible to irritation and itching.
Dry skin in winter mainly has the following aspects:
1, cuticle lack of water
The moisture in the air is reduced, and the moisture in the stratum corneum of the skin is also lost quickly.
2, slow metabolism
The speed of metabolism slows down, and the speed of blood flow slows down, and the water that brings to the surface of the skin naturally diminishes.
3, the speed of sebum membrane production slows down
Sebum film is what we usually say skin natural protective film. It is a film formed by mixing sebum secreted by sebaceous glands and exfoliated keratin. Reduced sebum secretion can not form enough sebum film to preserve the moisture in the skin.
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