First, the type of skin There are many ways to categorize skin types. At present, according to the water content of the skin, sebum secretion status, skin pH and skin reactivity to external stimuli, the skin is divided into five types: 1, dry skin, also known as dry skin, the water content of its stratum corneum is less than 10%, pH>6.5, sebum secretion is small, the skin is dry, lack of oil, skin lines, fine, pore is not obvious, wash your face after the feeling of tautness to the outside world stimuli (such as climate.) More sensitive to temperature changes, The skin is sensitive to external stimuli (e.g. climate, temperature changes) and is prone to cracking, flaking and wrinkling. Dry skin is not only related to congenital factors, but also related to frequent exposure to the sun and the use of excessive alkaline detergent. Neutral skin, also known as normal skin, is the ideal skin type. The water content of the stratum corneum is about 20%, pH is 4.5-6.5, sebum secretion is moderate, the skin surface is smooth and tender, not dry, not greasy, elastic, and adaptable to external stimuli. 3, oily skin, also known as seborrheic skin, mostly seen in young and middle-aged and obese people. The water content of the stratum corneum is about 20%, pH <4.5, sebum secretion exuberant, skin appearance greasy shiny, large pores, easy to adhere to the dust, skin color tends to be darker, but elasticity is good, not easy to wrinkle, the external stimulus is generally not sensitive. Oily skin is mostly associated with androgen secretion, high-fat foods and flavored condiments, prone to acne, seborrheic dermatitis and other skin diseases. 4, mixed skin is a mixture of dry, neutral or oily skin type. It is mostly characterized by oily skin in the central part of the face (i.e. forehead, nose, nasolabial folds and chin) and neutral or dry skin in the cheeks and temporal area. Trunk skin and hair condition is consistent with the head and face, oily skin hair is also more oil shiny, dry skin hair is also dry. 5, sensitive skin, also known as allergic skin, mostly seen in allergic people. Skin reactive to external stimuli, cold, heat, wind, ultraviolet light, cosmetics, etc. are more sensitive, easy to appear erythema, pimples and itching and other skin manifestations. Second, the choice of cosmetics for different types of skin 1, dry skin: the lack of oil and water skin. Lack of oil dry skin, should not use soap to wash your face, as little as possible with detergents, if you use, with weak alkaline soap, or weak acidic cleansing milk, wash the face of the water temperature of about 30 degrees Celsius is appropriate, wash your face should be wiped with more oil containing skin care products, such as cold creams, etc., to avoid exposure to the sun, available sunscreen. After washing your face, first use non-alcoholic lotion to soften your skin, then use a face cream externally. Lack of moisture dry skin, easy to flake and wrinkles, cosmetics should choose natural oils, such as olive oil, more beneficial than grease cosmetics. 2, neutral skin: is the ideal type of skin, moisture and sebum secretion moderate, the skin is not thick and thin, not too sensitive to external stimuli. Neutral skin is suitable for washing the face with soap, the range of choice of cosmetics is relatively large, the general cream cosmetics can be used. 3, oily skin, wash your face two or three times a day, it is best to use slightly acidic cleanser or alkaline weakened soap to wash your face, and then with camphor containing ingredients of the lotion coated face, you can astringent pores, to prevent the formation of pimples, choose the snow cream cream and other oil-containing less skincare products, should not be wiped with oily cosmetics and easy to clog pores of the powdered cosmetics. 4, mixed skin cosmetic selection can refer to dry, neutral or oily skin selection method as appropriate. 5, sensitive skin: if the choice of inappropriate cosmetics, very easy to appear red spots, blisters and itching and other allergic reactions. This skin as little as possible to use detergents, such as the use of weak acidic cleansing milk, wash your face at a temperature of about 30 degrees Celsius, cosmetic selection of non-irritating cold cream, snow cream, olive oil, or containing high-level fatty alcohol raw materials of the skin cream, is not easy to use with fragrance, PABA and fluorescent whitening agents containing sunscreen.