1. To prevent allergic reactions
Before using a new product, skin test should be done first, and then used when there is no reaction such as redness and itching. Once it is found that cosmetics have adverse reactions to the skin, it should be stopped immediately.
2. Different types of cosmetics should be used according to the climate
In cold and dry winter, cosmetics with high oil content should be used, and cosmetics with large moisture content should be used in spring, summer and autumn.
3. Do not use deteriorated cosmetics
Cosmetics contain fat, protein and other substances, which are easy to deteriorate or be infected by bacteria after a long time. Cosmetics should be fresh, generally used up in 3 to 6 months, and stored in a cool and dry place.
4. Do not use inferior cosmetics
In order to prevent the harm of toxic substances such as mercury and carcinogens in cosmetics, high-quality products approved by the Ministry of health should be selected.