I won't go into details about the hazards of solvents such as butanediol, propylene glycol and ethanol, because I found that many professionals on Baidu answered better than me. Skin care products are allowed because these ingredients can greatly stabilize the formula, make skin care products uniform and stable, delicate in texture, superior in touch or transparent, and are very eager to buy. So this issue is a business need, not a medical argument.
Regarding the use of masks for sensitive muscles, in fact, most dermatologists do not support the use of masks in pharmacology and pathology, but there are two very important reasons for some doctors to recommend the use of masks.
First, some doctors think it is very important to calm patients' emotions, so that patients can feel that their symptoms are relieved briefly and quickly, making them feel comfortable, even beyond the symptoms themselves. If you can't calm the patient's mood, then all the treatments are futile, and it is difficult for patients to cooperate, because all patients can't be expected to know scientifically. Therefore, the adjuvant treatment of facial mask is aimed at soothing factors, and this product is ineffective for this disease. I also hope that patients can understand the pains of some doctors. But now this kind of doctor's good intentions are used by unscrupulous merchants to brag about the efficacy of the mask, which we should be vigilant.
Second, the cost of maintaining the healthy operation of a hospital is actually very high, and some departments must lose money, such as intensive care unit and orphan department. State funds are tight, and hospitals need some income-generating channels to maintain. Dermatology recommends some masks with mechanical names to eliminate names, which is a good channel.
In view of the above two points, we should thank those patients who use masks recommended by doctors. Without your generosity, the hospital would really collapse.
Regarding hydration, the kinetics of skin water metabolism shows that our water is transported from the inside of the skin to the outside of the skin, that is to say, everyone is a slow water filter, and part of the water we drink is excreted, and part of it enters the keratinocytes of the skin through the metabolism of various organs, and finally floats from the keratinocytes of the skin to the surface of the skin, thus dissipating into the environment. On the contrary, the moisture on the skin surface can't enter the skin, because our skin is a layer upon layer of brick and mud structure, which is hydrophilic and hydrophobic, and neither water nor oil can cross this barrier. If you cross it, there will be skin problems. Therefore, the so-called moisturizing and hydrating is to enhance the skin's own water retention ability and reduce the loss of water through the skin, rather than hydrating from the outside.
The reason why lotion is not used is because most lotions need a lot of solvents to show a transparent and uniform state, or because of the harm of solvents.
Meiyan, which is based on medicine, has been established for almost 7 years, and its products have been on the market for almost 4 years. Whether it will work or not will take time and the market to answer this question. But is it urgent for you personally to solve the skin problem? How to choose so many skin care products? My suggestion is that you should listen to the opinions of professionals once, give them three months to give it a try and use it as required, and keep in touch with professionals if you have any questions. Don't make decisions without authorization and listen attentively. You have to think about who you want to give your skin to. If you don't know anything about each other, then education is also a reference, at least after layers of screening.
I hope my answer is useful to you.