"Skin color and hair color are formed by melanin, but the main function of hair itself for the skin is to keep warm and impact and other mechanical effects, this color is naturally not the most important, and even like the hair of polar bears simply does not contain melanin is completely colorless and transparent, only because of the refraction effect, it will appear white, this is the same as the principle of snowflakes, in fact, the vast majority of animals with white hair, if the smallest structure of the hair, is actually colorless and transparent, only after being combined together, it is white to be white。 ”

"The stratum corneum can be said to be transparent, but strictly speaking, it is not completely and absolutely transparent, in fact, there are melanin particles that they swallow when they are alive, these particles are deposited around the nucleus, preventing ultraviolet rays from damaging the most important chromosomes in the nucleus, it can be said that melanin production is not harmful, but it is a protective measure for the human body. ”

Liu Liping nodded, and then thoughtfully, Xu Yi was not in a hurry to say, just waiting there for her to have any questions, and after about half a minute, Liu Liping asked: "The increase in skin cancer and melanoma in Caucasians is related to these melanocytes?"

Xu Yi smiled and said: "Yes, not strictly speaking, this is all related to the lack of melanin protection, and even not enough for melanocytes to protect themselves and be penetrated by ultraviolet rays, which can be said to be an important risk factor for these two diseases." In addition, there are some people who are unable to form normal melanin due to congenital or acquired reasons, and they become albinism or vitiligo. Yan zhòng vitiligo may even be the same as McJack, from a black man, to a whiter than a white man. ”

I heard Xu Yi say that Mai Jie is vitiligo. Liu Liping couldn't help but retort: "Isn't McJie bleached skin?"

Women always like to watch gossip news, like this statement is what Liu Liping said from the website.

This time, even Yan Peimin had to refute: "Stupid." Many people have done this thing in the past, but this is mainly to hide the birthmark or repair the leprosy, which is too ugly. Talking about skin bleaching is a big deal. It is also the same as hair removal cream, it can only treat the symptoms but not the root cause, and most of those things have a relatively strong irritating effect or toxic side effects, and cannot be used continuously for a long time. Do you think, you have to bleach it every once in a while, so that you can't toss yourself to death, who will do that good person? He's not one of those people who just debuted, and he's afraid of racial discrimination, so he'll get these to cater to the fans. ”

"Think about it the other way around. If skin bleaching is really risk-free, and the operation is simple and convenient, then there may be a market for whitening creams on the market? Direct bleaching is more convenient, so even if McJay does use skin bleaching things, it can only be on the normal skin that remains near the white spots on the face. ”

Hu Yifei shook his head and said: "I think he may not have even used this method, and now the makeup technology is so advanced." He has been wearing heavy makeup since he was young, and it is likely that he was already very ill at that time, but at that time, he may have relied on makeup to cover up the white spots, and the lesion area was too large in the later stage. In turn, it hides less normal skin, and even does not except that all the exposed parts have lesions, and makeup makes the skin tone a little healthier, which is why the changes are so obvious. ”

"The third. Go on. Liu Liping directly urged Xu Yi to continue the original topic, after all, this is what she is more interested in.

"The keratin itself is transparent, and the stratum corneum is only a few tenths of a millimeter thick. Naturally, this cannot be seen directly with the naked eye, so except for the roughness of the stratum corneum, which refracts the reflected light. Anything other than making the skin look rough will not have any noticeable effect. ”

"The water that is absorbed into the cells by the salt. In the end, only after combining with these keratins can they be preserved for a longer time, otherwise this will soon be lost, but the keratin structure is very dense, which makes it very low in water absorption, only long-term soaking can make them absorb enough water, otherwise I am afraid that it will be the same as the result of soaking a hand, although there is still a little effect, but it is much worse than when it was just taken out of the water. ”

"After the keratin absorbs water, the volume will expand to about 1.5 times that of the previous drying, so that the keratin filaments will eventually support the cells more full. Moreover, after the cell swells and expands, it will inevitably make the melanin in the cell relatively less and more sparsely distributed, plus the keratin filaments after absorbing water are likely to have better refractive performance, which is the fundamental reason why the skin on your face now looks fairer than in the morning. ”

Liu Liping nodded, and asked Xu Yi again, "Even if you are right, but after I finish the mask, I will obviously feel that the skin has become much smoother, and even those pores are more inconspicuous, is this not true?" Seeing Xu Yi nodding, she also felt even more unwilling, and asked Xu Yi: "Why is this?"

Xu Yi explained with a smile: "After the mask, the skin will feel firm and smooth, but in fact, this is just the result of the swelling of the stratum corneum after absorbing water. When the cells of the stratum corneum swell, they naturally squeeze the nearby pores, making the pores smaller and even the smaller skin lines less noticeable. As he spoke, Xu Yi looked at the pimple on Liu Liping's nose again, and said with a smile: "Even the pimples on your forehead are not so red." ”

Hearing Xu Yi say this, Liu Liping happily asked, "Really, does this thing work so well?"

"It's just that these changes only occur in the stratum corneum, and they don't have much impact on the deep skin at all, in fact, it's still a kind of illusion that seems to be real, not what ingredients in your mask have any effect on this acne, even if the medication is not so fast, you put on a mask, it is impossible to have any immediate effect. ”

Liu Liping, who was rummaging through the bag, heard this, stopped, and asked angrily: "Is this really the case?"

Xu Yi shrugged, nodded and said: "But don't think that this is really what kind of miracle effect this mask has, if you look at the acne carefully, it looks like it is a little smaller, but the top of this acne is like a veil." In fact, this is just an illusion caused by the higher water content of the stratum corneum and thickening. Wait for the stratum corneum moisture to return to normal, how big or how big the acne should be. ”

The fat man also smiled and said, "The third child explains." I think it's like that, I think this mask brightens the complexion like white fungus. The dried white fungus looks pale yellow, and when it comes out, it becomes white and transparent, which is just because of the expansion, so those yellow pigments are more dispersed, so it can't be seen. ”

Xu Yi also smiled and nodded: "The fat man is a more vivid analogy, and that's really it, whether your mask has these effects, wait until tomorrow morning to verify it yourself." ”

Liu Liping asked Xu Yi: "You won't mean that I have been doing a mask for so long. It won't work until tomorrow morning, will it?"

Xu Yi asked her in turn: "Why do you need to apply moisturizer after making the mask?"

Liu Liping said: "Isn't this normal, after making the mask, the skin is transparent and detoxified, and it is better to absorb it with moisturizer at this time." ”

Xu Yi sighed and said, "What kind of messy logic do you have, which beautician did you learn from?"

Liu Liping looked at Xu Yi with strange eyes and questioned him: "Why, this statement is also wrong, you think too much about the third child." This is what is written on this beauty website, you must have thought too much!"

Raising his index finger and shaking it gently, Xu Yi said, "I think you must have washed your face with soap before making the mask, right?"

"yes, otherwise wouldn't the dust get into the pores along with the active ingredients in the mask?"

Xu Yi could hear the black line in his head. What kind of fallacy is this, it seems that women are really brainless in the face of beauty problems, even women with medical-related majors. Presumably, non-related practitioners must be even more ignorant.

"The only use of washing your face before making a mask is to remove excess oil from the surface of the skin. Avoid affecting moisture absorption, what does this have to do with dust, and pores are not so easy to get ash. In that case, what's the use of asking for hair. ”

As he spoke, Xu Yi pointed to the top of his arm and said: "Even if the pores on my arm look darker, this is not caused by dust, this is the result of more melanin accumulation, but it looks darker than the surrounding skin tone, like a little dirty, but it is not stained with dust at all." According to what you say, in the sandstorm weather in the capital, girls go out and go home, rub their faces, and they can't crackle and drop things out of these pores!"

"And why is that?"

"The sebaceous glands of the skin will secrete to the surface of the skin and mix with sweat to form a protective film, which is thicker, especially on the face" Speaking ......of this, Xu Yi looked up at a few people around him, and then pointed to Yu Hangsheng's face and said to Liu Liping: "Look at the triangle of the fat man, it is all oily, which is naturally the result of too much sebum." However, it is this protective film that effectively delays the evaporation of water from the skin, but this layer of film will inevitably make it more difficult for the stratum corneum to absorb water when making a mask, so some people will tell you to use soap to wash your face before making a mask. ”

"You've worn medical gloves, what happens after a long time?"

"The inside of the gloves is full of sweat, and it gets soaked, and even dew drops form on the gloves. ”

"Actually, it's not all sweat, for example, it's not so hot in winter, and even if you don't sweat, there will still be a lot of moisture in the gloves, remember?"

Seeing Liu Liping nodding, Xu Yi reached out and flicked the water cup in front of him, making a crisp sound, and said: "Under normal adult conditions, even if they don't sweat, the water evaporated through the skin in a day is almost half a cup. And this is the result of normal sebaceous secretion and not using alkaline soap for cleaning. After washing before making the mask, and before the oil mask is re-established, I am afraid that the evaporation rate of this water will be faster. ”

"If the stratum corneum is dehydrated, it is indeed beneficial to make a face mask. However, the moisture that enters the stratum corneum will not be retained forever, especially after the oil film is removed, and this will definitely be faster. In addition, because the stratum corneum has few ions and low osmotic pressure, it will constantly exchange with extracellular fluid, and it will also continue to lose moisture, even if you apply moisturizer, the effect of your mask will basically disappear by tomorrow morning. ”

"If you use soap or something to wash your face in the middle, I'm afraid that the speed will be faster, so you can say that your mask is done, and the hydration effect can only be so little time at most!" (To be continued......)