“Problem skin” refers to skin that is in a sub-healthy state or in a state of skin disease. Common skin problems are: hormone-dependent dermatitis, rosacea, acne, seborrheic dermatitis, chloasma, oily skin, dry skin, sensitive skin, dermatitis, eczema, etc. These “problematic skins” may be aggravated by the use of ordinary cosmetics. These “problem skin” if you use ordinary cosmetics, may make the skin “problem” aggravated, if you use drugs containing hormones, may be temporarily effective, but long-term use will appear hormone-dependent dermatitis. Therefore, the best choice for “problem skin” is to use medical skin care products, if necessary, together with medicines for treatment. There are five main types of “problem skin”: acne and pimple skin, pigmented skin, sensitive skin, aging skin, black and yellow rough skin. Acne and pimples are also known as “acne”, commonly known as “pimples”, “acne”, etc. It is a common chronic inflammation of sebaceous glands and hair follicles, the causes of which are complex. It is a common chronic inflammation of the sebaceous glands and hair follicles, with complex causes and high incidence, and is common in adolescence. Problem Skin 2: Pigmented Skin Pigmentation refers to spots that are different in color from the surrounding area. Pigmentation is due to the increase of melanin in the skin and the formation of a common facial brown or melanin pigmentation, disfigurement of the skin disease, most often in the cheeks and forehead, aggravated by sun exposure, most common in women, pregnancy, long-term oral contraceptive menstrual disorders, belongs to the traditional Chinese medicine of the diabetic black spots, liver spots. Problem skin three: allergic skin Allergic skin mainly refers to when the skin is subjected to a variety of stimuli such as adverse reactions to cosmetics, chemical agents, pollen, certain foods, polluted air, etc., resulting in redness, swelling, itching, peeling and allergic dermatitis and other abnormalities of the skin. Sensitive skin can be said to be a kind of unstable skin, is a kind of skin at any time in a high degree of vigilance. Problem Skin IV: Aging Skin Skin aging is the phenomenon of skin aging caused by natural or unnatural factors. After birth, skin tissue becomes increasingly developed and active, and when it reaches a certain age it begins to deteriorate, and this deterioration often takes place slowly without people realizing it. Skin tissue growth period generally ends at about 25 years of age, some people call this period for the “skin of the corner”, since then growth and aging at the same time, the skin elastic fibers gradually become thicker, 40-50 years of age, the skin of the aging slowly and obviously, but the degree of aging varies from person to person. Problem skin five: yellow, black rough skin natural black and yellow pigment heavy, excessive sun exposure, the use of poor cosmetics caused by the skin metabolism is weak, unable to remove the waste in the skin out of the body, resulting in yellow, black rough skin. At present, the China Food and Drug Administration Cosmetic Hygiene Standards has not yet established a “medical skin care products” classification and management mechanism, it is still categorized in cosmetics, but many manufacturers of “medicine and cosmetics” concepts flying all over the place, it is difficult for the general public to determine which is the true medical Skin care products, at the same time, it is also difficult to choose their own skin characteristics and skin problems according to their own medical skin care products, 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, in order to play its best efficacy.