1, the reason that affects skin color
The thickness of cuticle of skin epidermis. The stratum corneum is thick and the skin color is yellow; The granular layer and transparent layer are thick and the skin color is white; Dermal blood circulation is sufficient, and the skin will appear ruddy; If the skin surface is uneven, the skin color is blue.
Melanin. Melanin is produced by melanocytes, which are dark brown or yellowish brown pigments that stain hair and skin. The depth of black tone of skin color is closely related to melanin. It is also the main cause of skin color change.
Endocrine. The effect of endocrine on skin color is mainly achieved through the effect on melanin. Estrogen can also stimulate melanocytes to secrete melanin, while progesterone can promote the transport and diffusion of melanin. Leading to obvious pigmentation in pregnant women-pregnancy spots.
Nutrition. Various metabolic processes in the human body, including pigment metabolism, are related to nutrition. For example, vitamin C can reduce the dark oxidation fermentation products in melanin metabolism, thus making the pigment lighter. Vitamin A deficiency leads to hyperkeratosis and pigmentation of hair follicles. Nicotinic acid deficiency can be sensitive to light, leading to pigmentation. Trace elements also play an important role in melanin metabolism, among which copper ions and zinc ions are more important. In addition, some heavy metals, such as arsenic, zinc, silver and gold. It can increase melanin production and cause skin pigmentation by enhancing tyrosinase activity.
2. Understanding of skin color
What kind of skin is healthy and what kind of skin color is it when it is healthy and normal?
The medical definition of healthy skin is 1, with clear lines and thickness; 2, with a uniform skin color (uniform skin color throughout the body); 3. Sufficient moisture and grease, and water-oil balance; 4, flexible and elastic, naturally revealing red from the skin, as the saying goes, "white inside is red."
Why whitening skin care products are not white every day? How to whiten is effective?
Exfoliate 1-2 times a week, and whiten mask 1-2 times a week. Eat more foods containing vitamin C, such as lemon and kiwi fruit. Sun protection should be done outdoors or indoors, especially indoors to avoid computer radiation and ultraviolet pollution of fluorescent lamps. If we are born with healthy skin color because of heredity, then we should accept the original skin color of our human body and let whitening skin care products solve the problem by focusing on translucent and partially dull skin.
Can acne scars and acne marks be completely removed only by whitening products?
After applying make-up water, massage with whitening essence, and then apply it to the place with acne marks with a cotton pad, and stick to it, and the acne marks can be gradually eliminated in the future. In addition, lavender essential oil also has the effect of lightening scars. If the pits have formed, it will be difficult to completely remove them with whitening products. Can whitening products achieve the same whitening effect as medical beauty? It must be used for a long time and combined with correct daily habits. Medical beauty can get quick results, but it also has risks. Relatively whitening products are safer, but we should insist on using massage.
I want to completely freckle, but I am afraid that allergies will cause more skin problems. Can I really freckle safely? How to whiten sensitive muscles?
Whether the spots can be completely removed depends mainly on what kind of spots they are. For example, freckles are hereditary and there is basically no way to completely eradicate them. Even if laser freckle is done, it can be removed in a short time, but freckles will appear again because of the role of genetic genes. If it is sunburn, dark spots and chloasma, it is caused by many factors, such as endocrine disorders, slow metabolism in Xincheng, taking certain drugs (such as birth control pills), long-term excessive ultraviolet radiation, improper use of cosmetics and so on. First of all, we must choose whitening products that do not contain harmful substances such as hormones, lead and mercury. There are many side effects, and serious ones can lead to disfigurement. Second, we must do a good job in sun protection. Sunlight can increase melanin activity and increase melanin content in the basal layer of epidermis, resulting in pigmentation. Moreover, the active ingredients in many whitening products are afraid of light. After using perfect white products during the day, you must do enough sun protection and replenish them at any time. Finally, moisturizing is also the most basic step of freckle removal, maintaining a good attitude, getting enough sleep, and combining internal and external "freckle removal".
Will the use of whitening products dry the skin?
The answer is no, whitening products add more moisturizing ingredients. If you are still afraid of insufficient moisturizing, you can choose a cream with whitening and moisturizing effects after the essence.
3. Introduction of allergic causes
First, changing seasons leads to facial allergies.
When changing seasons, due to the rapid changes in the external environment, the skin can not fully adapt, leading to acne on the face. Most allergic phenomena are dry skin, which is short of water for a long time and is easily affected by strong winds and bad weather. Therefore, in the season of changing seasons, we should pay attention to personal skin quality and usual care, otherwise sensitive skin will come into contact with allergens in the air, leading to facial allergies.
Second, cosmetic discomfort leads to facial allergies.
People with sensitive skin are prone to allergies. If the cosmetics you choose are used carelessly, your face will be allergic to acne. In severe cases, your face will become red, swollen and itchy. Moreover, some people are greedy for cheap when choosing cosmetics, and use some chemicals that irritate the skin. It is also easy to cause facial allergies after use.
Third, endocrine disorders lead to facial allergies.
Long-term bad work and rest or bad living habits can easily lead to endocrine disorders of the body, such as frequent overtime and staying up late surfing the Internet, which will destroy the original balance of the body and cause hormonal imbalance, which will form allergies when reflected on the face.