1. Causes of oily skin
1. Sex and age The secretory function of sebaceous glands is strong at birth, and it drops to a very low level after 6 months, and remains at a low level in childhood. From the beginning of puberty, the secretion of sebaceous glands in both men and women gradually increased, reaching a peak at the age of 16 to 2, and then maintaining this level. Sebaceous gland secretion began to decrease after the age of 4 in women and 5 in men.
2. Endocrine factors Sebaceous gland is a target organ of androgen, and its hyperfunction is mainly related to the imbalance of sex hormone secretion. Testosterone increases the volume and secretion of sebaceous glands. Especially, the excessive activity of 5α- reductase, the catalyst of sebum synthesis in human body, leads to the increase of dihydrotestosterone secretion, which leads to the increase of sebaceous gland secretion.
3. Humidity of the skin The humidity of the skin surface will affect the secretion and diffusion of sebum. When the skin surface humidity is high, the emulsification and diffusion of sebum will become slow. When the skin is in a dry environment for a long time, sebaceous glands will be overactive and produce abnormal oil.
4. Dietary factors will affect the secretion of sebaceous glands. Eating greasy food, spicy food and food with high sugar and calorie can increase the secretion of sebaceous glands.
Second, oily skin care
1. Moisturizing and hydrating: The most fundamental reason for oily skin is lack of water, and the imbalance between water and oil will continue to emit oil. Therefore, the work of hydrating and moisturizing is very important and indispensable.
2. Wash your face correctly: When washing your face, don't wipe it hard on the surface of your skin, or just gently press the water off your face with a clean towel after the dirt is washed off your face. Reduce skin friction and better maintain pore formation.
3. Wash your face with running water: This is a small detail in the process of washing your face, and many people will not notice it. The so-called living water is flowing clear water.
Third, how to improve oily skin
1. Wash your face alternately with cold and hot water
Wash your face with hot water first to open the pores, so that all the stains in the pores can be cleaned. Excessive temperature may dilate your capillaries and cause more oil secretion.
Therefore, the water temperature of about 4 degrees is the most suitable. When washing your face with hot water, you should use cleaning products such as facial cleanser and soap, but don't use it when washing your face with cold water. Cold water can shrink pores and reduce sebum secretion. Wash your face with hot and cold water at least twice a day in the morning and evening.
Remember: don't wash your face frequently
This will only refresh you temporarily, but the more times you wash your face, the more you stimulate the secretion of sebaceous glands, and the more you wash it, the more oily it will be. And what is even more frightening is that the cuticle is thinner and thinner.
2. Choose a sunscreen with water quality
The ultraviolet rays in summer are very strong, so MM with oily skin can take sunscreen and oil control measures when going out. Oily skin should choose sunscreen with strong water quality and less oil. After applying sunscreen, it is best to lightly print the face with oil-absorbing tissue or apply oil-controlling water to reduce the oily texture.
Remember to remove makeup after applying sunscreen
Sunscreen lotion mixed with skin care products is adsorbed on the skin surface. If you don't remove makeup, it will easily block pores, make the skin unable to breathe normally, and lead to subcutaneous oil accumulation, which not only makes the skin more and more oily, but also may produce acne and acne.
3. Moisturizing toner
Skin loves to get oily, which is often caused by lack of water and dryness of the skin. If the skin is not balanced in water and oil for a long time, it will be prone to the skin condition of dry inside and oily outside, so as long as it is hydrated, the skin will not become greasy easily.
remember: don't use shrink water instead of moisturizing
shrink water can inhibit the secretion of oil and shrink pores at the same time, but the alcohol in shrink water will make the skin rough and dry, which will hurt the skin and aggravate the dryness of the skin. Therefore, it is suggested to use moisturizing toner with refreshing effect instead of shrinking water.
4. Using mild cleanser
The skin is easy to dry, so you should avoid using those high-strength and high-alkalinity cleansing products, because such cleansing products will make your face dry, which will deepen the secretion of oil, and the more you wash, the more oil you get. Therefore, it is recommended to use a mild cleanser for oily skin care.
Remember: Don't exfoliate excessively
Although the cuticle of oily skin will be thicker, the keratin metabolism has its own renewal cycle. Oil production will indeed make the keratin problem more serious, but frequent and excessive exfoliation will easily harm healthy skin. In order to protect the skin, sebaceous glands will of course secrete more sebum.