What is Sensitive Skin Strictly speaking, sensitive skin is not a disease, but a subhealthy state of the skin. When subjected to external stimuli, this skin is prone to objective symptoms such as erythema, papules and especially capillary dilation, while the patient feels a self-induced tingling sensation, burning sensation and is intolerant to common cosmetics, a condition we call sensitive skin. Medically, sensitive skin is divided into two main categories: primary and secondary. Primary such as genetic factors, especially women with thin skin epidermis are easily sensitive; at the same time, there are many skin in dermatology that can be complicated by sensitivity, such as inflammatory skin diseases (acne, solar dermatitis), drugs (hormones, retinoids, salicylic acid), inappropriate skin care and whitening spot removal (peeling syndrome), minimally invasive and invasive skin treatments (post-laser surgery), etc., when dermatologists should be concerned. Main Causes and Potential Groups of Primary Sensitive Skin Due to genetic factors, some people have a thin epidermis, and because there are no blood vessels in the epidermis, the dermal blood vessels are exposed. Under external stimulation such as heat, sunlight exposure, air pollution, etc., capillary dilation is severe, and coupled with indiscriminate use of cosmetics will induce sensitivity. Clinical Diagnostic Criteria for Sensitive Skin Patients often feel that their skin is red with a burning sensation and cannot tolerate normal skin care products. It can also be seen through some equipment that erythema and capillary dilation are more pronounced in patients with sensitive skin than in normal people. Overview of treatment countermeasures for sensitive skin To deal with sensitive skin, first, we need to educate patients about health, the timing of treatment, and grasp the starting and ending points of treatment. Secondly, regarding the treatment principles of the whole general framework, the first is to restore the skin barrier and advocate patients to use medical skin care products instead of general skin care products, because the most common things that cause adverse reactions to cosmetics are fragrances, pigments, and preservatives, and our medical skin care products are defined as those that do not contain these ingredients. Sensitive skin must be divided into an acute phase and a stable phase. In the acute phase, it has vascular nerve hyperreactivity and an inflammatory response.