What is “problem skin”? Why should “problem skin” be treated with medical skin care products under the guidance of a dermatologist? ”Problem skin” is defined as skin that is in a subhealthy state or in a state of dermatological disease. Common problem skin conditions include eczema, hormone dependent dermatitis, rosacea, acne, seborrheic dermatitis, chloasma, oily skin, dry skin, sensitive skin, etc. If these “problem skin” conditions are aggravated by the use of common cosmetic products, it is possible that the skin “problem” will be aggravated. “If you use hormone-containing drugs, they may be temporarily effective, but long-term use will lead to hormone-dependent dermatitis. Therefore, the best choice for “problem skin” is to use medical skincare products, and if necessary, to treat with drugs. At present, the Chinese Food and Drug Administration has not yet established a classification and management mechanism for “medical skin care products”, and still classifies them as cosmetics, but many manufacturers are flying around with the concept of “medicinal cosmetics”, so it is difficult for the general public to determine which is the real medical skin care products. At the same time, it is also difficult to choose the right medical skin care products according to their own skin characteristics and skin problems, it is difficult to achieve the prevention and treatment of skin diseases and skin beauty purposes, therefore, medical skin care products should be used under the guidance of dermatologists, currently in the professional field of dermatology has been unanimously recognized by domestic and foreign brands such as Winona, Avène, Vizi, Skin Spring.