What is sensitive skin? Sensitive skin is a non-healthy state of the skin caused by weakened skin barrier function and elevated skin vascular nerve reactivity. It is manifested as sensitivity to many minor external stimuli, such as: hormone dependent dermatitis, cosmetic damage dermatitis, solar dermatitis, acne, melasma (secondary, barrier damage), after medical intervention (secondary, barrier damage), etc. Clinical manifestations include varying degrees of itching, burning and tightness, dryness and tingling, and erythema and flaking visible to the naked eye. Skin allergy, on the other hand, is a symptom of the disease, which refers to the redness, swelling and itching of the skin caused by various factors. The relationship between sensitivity and allergy is as follows: first, sensitive skin is a non-healthy state of the skin, sensitive skin is prone to allergies, treatment of sensitive skin can reduce the incidence of allergic skin disease; second, many patients suffering from allergic skin disease skin is sensitive skin, professional repair of sensitive skin can significantly relieve symptoms and control the condition of allergic skin disease. How to determine if you have sensitive skin? Patients with sensitive skin often feel a burning sensation, tingling sensation, itching, tension and discomfort, dryness and pain on the face, with varying degrees of severity. Symptoms are aggravated by sun exposure, use of cosmetics, hot and cold environments, consumption of spicy or seafood, alcohol consumption, emotional stress, etc. Patients with sensitive skin not only show the above-mentioned self-conscious discomfort, but also often show facial erythema, flushing, swelling, red papules, dryness, flaking, and capillary dilation in the absence of obvious facial skin damage. If you often have the above symptoms, you should belong to sensitive skin, then you need to take good care of it. How to take care of sensitive skin? There are four main aspects in dealing with sensitive skin: monitoring, repair, treatment, and prevention. Here we mainly introduce the first two. In terms of monitoring, rough monitoring is mainly woods lamp to observe skin redness, dryness, check acne and monitor skin reaction after using cosmetics; fine monitoring is mainly done with dermoscope to observe local inflammation, exudation performance and vasodilation, etc., dermal turbidity, degree of light transmission, observation of keratin metabolism, pigmentation, hair, etc.; there is also a fine monitoring is VISIA skin detection equipment. It can observe the pigment, blood vessels, collagen sun damage and skin health within 2mm under the skin, and can measure and monitor these changes over time. In terms of repair, the first is skin care repair, which is something most patients can do on their own. Skin care repair includes a variety of medical skin care products, which are different from traditional cosmetics, between drugs and cosmetics, can restore the skin barrier, have efficacy, safer, and do not contain fragrances, colors, allergy-causing preservatives and other additives that can easily cause skin sensitivity. There are three main types, one is hot spring water represented by Avène, Vyse, Skin Spring, Iquan, etc., which is rich in minerals and trace elements; the second is plant active ingredients represented by Winona, etc., whose ingredients are mainly extracted from plants, without chemical additives and allergenic ingredients, and the active ingredients are easily absorbed; the third is medical skin care products containing glycerin, hyaluronic acid, tranexamic acid to increase skin hydration and repair the skin barrier. The medical skincare products, representatives of: Eucerin, Yuzhe, DQ, etc.. In addition to skin care repair, there are also instruments supporting repair, usually cold spray + import, which needs to be carried out in the hospital. In terms of treatment: mainly some lasers, ultra-pulse fractional excitation, Nd:YAG laser treatment instrument, 585 dye laser, etc. In terms of prevention, it is mainly necessary to take necessary measures to prevent skin sensitivity after medical interventions (such as wrinkle removal, skin rejuvenation, hair removal, etc.). In short, as the external environment is deteriorating more and more, more and more people have sensitive skin, plus the knowledge of skin care is not popular, the people abuse hormones or use beauty products indiscriminately, resulting in a beautiful face with thin epidermis, less sebum secretion, drier, more dry, microvascular obvious, and skin showing dry function decreases. A simple piece of science, I hope to give some guidance to women who love beauty, so that we all have a beautiful skin.