The outermost layer of our skin is the stratum corneum, which is our skin’s first line of defense and an important skin barrier. 85% of our moisturizing function depends on the stratum corneum, and if too much is removed, the skin will feel abnormally dry and will greatly increase the sensitivity of the skin. Many beauty products in the advertising campaign said “dead skin” is the stratum corneum, called “dead skin” because they believe that the stratum corneum is useless, will only make the skin looks dull, remove the “dead skin “After the skin will be like a new life, and white and tender, so many products are playing the “dead skin” sign to attract customers. I do not know, the metabolic cycle of the skin stratum corneum for 28 days, excessive and frequent exfoliation and cleaning of the skin, so that the stratum corneum has been seriously damaged, no opportunity and time to repair, the skin is thinner, but at the same time also become defenseless and sensitive, manifested as the skin is prone to redness, winter into the room with heating, wind will lead to redness of the face, and even some people’s hair swept in the face will be red! Other common manifestations are dry skin, peeling, even external moisturizers can not be relieved; with the original non-allergic skin care products will have tingling, itching and other discomfort; this skin is also more likely to grow acne and pustules. This type of problem skin we call “sensitive skin”. One of the main causes of sensitive skin is excessive cleansing and exfoliation. Other common causes include excessive beauty treatments and makeup, topical use of hormonal creams and skin care products on the face, etc. These bad habits can lead to abnormal thinning of the skin’s stratum corneum. Therefore, as a professional dermatologist, I would like to say to all women who love beauty: cheek or “thick” a little better.