There are a variety of skin care products on the market, the guide for your face acne, scars, dark spots, wrinkles and other problems to give a hundred ways to explain, exhorting you to moisturize and hydrate to remove oil deep clean, etc., in short, can not let go of any of your desire to buy. The positive attitude of the shopper is admirable, but you need to have a sufficient understanding of your own skin in order to properly use skin care products, so that it can play the highest performance, so that your money spent on the edge of the knife. Here I’ll lead you through an in-depth discussion of your skin type: Skin varies greatly from race to race and from individual to individual, and there are various ways to classify skin types. At present, there are five types of skin based on skin water content, sebum secretion, skin pH (acidity) and skin reactivity to external stimuli: 1. Dry skin, also known as dry skin, the water content of the stratum corneum is less than 10%, pH>6.5, sebum secretion is low, dry skin, lack of oil, fine skin lines, pores are not obvious, a sense of tightness after washing the face, sensitive to external stimuli (such as climate, temperature changes) (such as climate, temperature changes) sensitive to external stimuli, prone to skin cracking, flaking and wrinkles. Dry skin is not only related to congenital factors, but also to frequent exposure to the sun and the use of too many alkaline detergents. 2. Normal skin, also known as normal skin, is the ideal skin type. The water content of its 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 more adaptable to external stimuli. 3. Oily skin, also known as lipid skin, is mostly found in young and middle-aged people and obese people. The water content of the stratum corneum is about 20%, pH <4.5, sebum secretion is strong, the appearance of the skin is greasy and shiny, pores are large, easy to adhere to the dust, skin color is often dark, but good elasticity, not easy to wrinkle, not sensitive to external stimuli in general. Oily skin is mostly related to androgen secretion, high-fat food and fragrant condiments, prone to acne, seborrheic dermatitis and other skin diseases. 4. Combination skin is a type of skin where dryness, neutrality or oiliness is mixed. Mostly, the central part of the face (i.e., forehead, nose, nasolabial folds and chin) is oily, while the cheeks and temporal area are neutral or dry skin. The skin and hair of the trunk are generally the same as those of the head and face, and the hair of those with oily skin is also oily and shiny, while the hair of those with dry skin is also dry. 5. Sensitive skin is also called allergic skin, mostly seen in allergic people. The skin is highly reactive to external stimuli, sensitive to cold, heat, wind, ultraviolet rays, cosmetics, etc., prone to redness, papules and itching. If you can't make an accurate judgment, you can go to a regular hospital or institution to have your skin tested to determine your skin type, and then have targeted skin care to make yourself more and more beautiful.