Cosmetic essence is generally harmful, but it is not very serious. If it is sensitive skin, women should try not to use it to avoid skin allergy. To prevent skin allergies, we should also avoid using expired or hormone-containing cosmetics and strengthen the cleanliness of the face at ordinary times. It is best not to eat spicy or greasy food often. Avoid makeup before going to bed at night. The amount of essence in cosmetics is very small, but it is the most common factor that causes allergic reactions and other stimulating reactions in cosmetics. According to statistics, each essence is sensitive and irritating to some people, including allergic contact dermatitis.