Now the market mask water is too deep, not moving to find out the prohibited ingredients, so many people intend to use homemade masks in the future, think they make their own mask with fruit and milk ingredients are all natural, there is no harm to the skin, so would rather trouble a little, but also to make their own mask! But, how much do you know about this matter of making a mask? First of all, from the level of efficacy: fresh ingredients have a short shelf life, and when you make your own at home, the dosage and concentration do not reach the exact ratio. In addition, some materials only let the stratum corneum retain water, but can not lock water, not to mention deep nourishment, so the skincare effect is unstable and maintain time is very short. The common milk, yogurt and other dairy products, rich in protein and fat, molecular weight, without processing, can not penetrate into the skin, when the milk fat attached to the skin surface, not fully absorbed, there will be a touch “fake smooth” effect, resulting in a homemade mask is very effective illusion, in fact, not only the effect is very weak. The effect is not only weak, but also affects and changes the skin’s acidity and alkalinity with regular use. Secondly, from the level of harm: in the home environment, the use of natural raw materials for homemade masks, the lack of a good sterile environment, if pesticides, microbial residues on fruits and vegetables, applied to the face is easy to produce bacterial infection, especially in the case of small wounds on the skin, acne or inflammation, will cause a series of skin problems. In addition, many people do not know enough about the characteristics of fruits, and blindly apply the products originally intended for consumption on the face, which also causes great potential problems. For example, if you make a mask with light-sensitive fruits and vegetables, during the masking process, the skin is exposed to the air, and the oxidation of fruits and vegetables is faster than the absorption rate of the skin, which will lead to a large amount of vitamin C oxidation before it has time to be absorbed by the skin, which then triggers an allergic reaction to sunlight, allowing the skin to return to black, causing flaking, itching, redness and swelling phenomenon. So people with sensitive bodies should not easily try homemade masks, and for people prone to allergic diseases such as hives, skin eczema or bronchial asthma, homemade masks should be even more cautious.