Sensitive skin is a skin that reacts sensitively to external environment, cosmetics, and facial cleansing. It is reddened by small elements and various troubles occur. It is genetically dependent on race, age, and gender, but environmental factors and lifestyle are the most common causes. It can also be caused by excessive exposure to cosmetics or ultraviolet rays. Rough cleansing, excessive exfoliation, and exposure to irritation from contaminants can cause inflammation, which can result in fine and invisible damage. This makes the skin more sensitive. Especially for women, diet and stress can affect the immune system, and seasonal changes and hormonal changes can also cause nervous reaction.