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What exactly is skin aging?
All skin care products, medical beauty, and beauty equipment are talking about skin aging and anti-aging, so what exactly is skin aging? How do you age? Which tissues are aging?
The skin can be divided into epidermis, dermis, subcutaneous tissue, fascia layer and muscle layer from the surface to the inside. The epidermis is located in the superficial layer of the skin. It is composed of keratinized stratified squamous epithelium. The thickness is generally 0.04-0.2mm. It belongs to the depth range of skin care products. Going deeper, almost all skin care products cannot be involved, so please be wary of those propaganda A skin care brand that works on the dermis. The dermis is located below the epidermis and is mainly composed of connective tissue. The thickness is generally 1-3mm, and the thinnest is 0.3mm at the eyelid. If the elastic fibers and collagen fibers in the connective tissue degenerate, the density and elasticity of the dermis will weaken, and the stretchability and smoothness of the epidermis will decrease accordingly, and skin wrinkles will appear, which is what we call aging.
Collagen fibers and elastic fibers endow the skin with sufficient elasticity and toughness. Collagen fibers account for 80% of the dry weight of the skin, making the skin elastic and resistant to tension and compression. After the age of 20, the number of collagen fibers in the dermis of the skin decreases by 1% per year, the collagen fibers begin to age, the ability to synthesize collagen decreases, and skin wrinkles begin to form. Therefore, the key to reducing wrinkles is to promote the synthesis of collagen and increase the production of collagen fibers. Quantity, so that the new collagen fibers to rearrange, restore the various mechanical properties of the skin.
Facial skin aging is mainly divided into intrinsic aging and extrinsic aging. Intrinsic aging is mainly natural aging, including cell aging, free radical theory and hormone level reduction, etc. External aging is mainly photoaging, glycation, etc.
Natural aging: increasing age-reduction in skin moisture content-reduction in the number of sebaceous glands-reduction in sebum secretion-gradual loss of activity of dermal fibroblasts-collagen synthesisReduced-the appearance of fine lines on the skin.
Photoaging: About 65% of skin aging is caused by ultraviolet rays. Repeated exposure to ultraviolet rays for many years will increase melanin and form spots. At the same time, the ultraviolet rays that reach the dermis denature and deteriorate collagen, and take away the elasticity of the skin little by little, leading to wrinkles. https://www.merokbo.com/
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