Sensitive skin is a highly sensitive skin condition that refers to a multi-factor syndrome in which the skin is easily provoked by temperature changes, climate changes, emotional changes, external contacts, and other factors that produce subjective symptoms such as tingling, burning, tightness, itching, redness, swelling, and dryness. A. Sensitive skin mechanism: 1. Enhanced nerve conduction: The neural regulation of sensitive skin may be related to endothelin receptors, temperature receptors, and neurotrophic factors. Some scholars speculate that people with sensitive skin may have variant nerve endings, release more neuromediators, have a unique central information processing process, chronic nerve endings damage, or slow neuromediator clearance and other effects together to produce this response. 2. Decreased skin barrier function: Studies have shown that the transcutaneous water loss rate of sensitive skin individuals is elevated and the permeability of the skin barrier is elevated. Poor skin barrier function not only increases the penetration of topical chemicals; it also reduces the protection of nerve endings, leading to a significant increase in signal input from sensory nerves. 3. Sensitive skin is also associated with various stimuli leading to vasodilation and the release of certain inflammatory mediators. Sensitive skin should be distinguished from “skin allergy”, which is mediated by allergic reactions and only reacts to those allergic substances, while sensitive skin is more of a primary irritant reaction, with a lack of specificity of the irritant substance and an emphasis on its abnormal neuromodulatory mechanisms. Sensitive skin is prone to skin allergy due to the fragile barrier function. Second, the formation of sensitive skin causes: 1, facial skin stratum corneum thin, long-term exposure to the external environment, vulnerable to external contacts, temperature changes, climate change and other effects. 2, personal physical differences, such as race, age, gender, genetics and poor lifestyle, psychological factors, etc. are prone to overreaction or allergic reaction to stimuli that should not normally have. For example, sunlight, pollen, hot and cold stimuli, temperature changes, etc. 3, certain skin diseases (such as facial seborrheic dermatitis) and the treatment of certain skin diseases (such as the external use of irritating drugs, skin peeling, long-term external use of hormone ointment, etc.) can lead to the destruction of the normal skin barrier function. Third, how to deal with sensitive skin: 1, avoid contact with various irritants. Such as sunlight, dust, pollen, acid and alkali, etc. Do not use too hot or too cold water to clean the skin, do not over-scratch. 2, avoid deep cleaning care, exfoliation. Do not use alkaline soap-based cleaning products, scrubs, etc. 3.Under the guidance of professional dermatologists to carry out the necessary and appropriate physical therapy, such as laser, photon, etc. 4.Advocate scientific and standardized skin care. Use medical skin care products that do not contain preservatives and fragrances to repair the skin barrier function and restore the skin’s tolerance. Such as Winona soothing series products.