In recent years, there has been an increasing number of facial disorders in dermatology clinics, with an increasing incidence of skin allergies, skin discoloration, and chloasma. Why does this happen? Cosmetics have a lot to do with facial diseases. Substandard cosmetics, cosmetics produced by small manufacturers, cosmetics used in beauty salon lines, and cosmetics purchased online are the hardest hit areas leading to skin problems, and the use of cosmetics is pursued among people with facial diseases, and there are plenty of clues proving that such cosmetics and facial allergies have a great relationship with irritated discoloration. Even with the regular manufacturers, the ingredients in the well-known brands are not guaranteed to be non-irritating to the skin. Many patients with sensitive facial skin cannot tolerate adult skin care products and then use baby skin care products instead. There are few such cases. Common allergic factors in skin care products: 1. Fragrance: The proportion of fragrance allergy is very high, chemically synthesized fragrances, naturally extracted fragrances, all may lead to skin sensitivity and irritation symptoms. It is also the most common allergen in the patch test allergens. 2, preservative allergy: the vast majority of skin care products have preservatives, both high-level and low-grade skin care products, cosmetics without preservatives are rarely seen. 3, irritation: especially whitening ingredients, moisturizing ingredients, some irritation is quickly appear, and some irritation symptoms are gradually appear after using a period of time. Especially the latter, the slow appearance of skin reactions is what makes people unpredictable. How to choose the right cosmetics according to your skin characteristics is the key to ensure that your skin does not have problems.