What exactly is water-oil balance?

What exactly is water-oil balance?
Water-oil balance means that the skin's moisture content and sebum secretion are just right, the skin is neither dry nor shiny, the skin is delicate and elastic, without acne and other problems, and it exudes a healthy luster. The skin needs a certain amount of moisture to maintain normal Physiology and barrier function. The water content of the dermis is as high as 80%, and the farther away from the dermis, the lower the water content. So the stratum corneum usually has a water content of 20%-30%. However, if the climate is dry, the water content of the stratum corneum will drop rapidly. When the water content of the stratum corneum is less than 10%, the skin will not only be dry, but also its barrier capacity will also decrease. It refers to "sebum", that is, the lipids secreted by sebaceous glands and then to the surface of the skin to form a "natural sebum film", which is rich in many moisturizing factors.
To have good skin, the balance of water and oil is very important.
1. Appropriate moisture: maintain normal stratum corneum metabolism function, maintain supple and smooth skin texture, and maintain normal skin barrier.
2. Moderate oil content: Make skin soft and moist, maintain skin barrier function, avoid water loss, maintain normal function of hair follicles (such as chicken skin is seriously lacking sebum), and is a delivery tool for antioxidants.
What warnings does the skin give when water and oil are in balance?
1. Less water + less oil
Typical dry skin is dehydrated and has too little sebum, resulting in low moisture retention. Unable to lock in moisture, it dries out.
2. Less water + more oil
Combination skin The cheek area is dry and dehydrated, lacking oil protection. The T zone has a strong sebum secretion and is more oily. Compared with other skin types, skin care for combination skin requires separate maintenance.
3. More oil + more water
For oily skin, excessive sebum will not only enlarge the pores, but also cause abnormalities in the pilosebaceous glands, resulting in acne.

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