The common characteristics of people with sensitive skin are whiter skin, thinner surface keratin, drier skin texture, susceptibility to acute irritation, and poor resistance to mechanical abrasion. Daily skin care maintenance should choose products that do not contain irritating ingredients, fragrances and allergy-prone ingredients, such as alcohol, preservatives, fragrances, colors, emulsifiers, parabens (PABA), etc. Fruit acids can dissolve aging keratin, make the skin feel soft and shiny, and improve rough skin texture, but excessive exfoliation will reduce the skin’s defense function, so that other additives in cosmetics, such as preservatives, fragrances, etc. can easily penetrate into the skin cell membrane, causing allergies or other lesions. For sensitive skin, it is better to stay away from such irritating ingredients as fruit acids, and it is better not to use cleansers and other oil removal products. When buying hypoallergenic cosmetics, it is best to look for anti-allergic ingredients such as chamomile blue, allantoin, ceramide, glycyrrhetinic acid, β-methyl carboxylic acid polydextrose, palmitoyl collagen acid, etc., in addition to requiring no irritating ingredients. Allergy-prone people, whose cuticles are usually thin, are not suitable for alkaline formulations or products containing high concentrations of fruit acids. It is best not to use facial cleansers and avoid frequent face washing and grooming. Some people have dry skin, these people have rough cuticles and are prone to allergic rashes and acne. This kind of skin itself is not good water retention, the maintenance products used to contain the right amount of oil cream type more appropriate. The actual fact is that you will not be able to use a facial soap that is too strong to remove fat. Some people have dry and rough skin, only moisturizing is not enough to improve the roughness of the skin, should be exfoliating care. Salicylic acid, fruit acids, and exfoliating enzyme powder can repair rough and dry skin. In addition to using high levels of unsaturated oils, oil-soluble amino acids and ceramides are also good choices. Some people who have acne also have dry skin because dry skin can also lead to acne during puberty or after improper use of cosmetics. Since the skin is dehydrated and the keratin is thin, it is advisable to choose mild and antibacterial tea tree oil or maintenance creams with low concentration of retinoic acid, in addition to oil and water when choosing maintenance products, to avoid sulfur, salicylic acid and resorcin that may cause dry skin. Dry sensitive skin Don’t use lotion Some people have dry sensitive skin, which is related to genetics or improper use of cosmetics. It is best for this type of person not to use lotion and to rub cream directly after washing the face. This is because lotions mostly contain surfactants, colorants, fragrances, preservatives and other ingredients that can be irritating to the skin. Surfactants help the moisturizing ingredients of the lotion penetrate into the stratum corneum, but at the same time reduce the defense ability of the stratum corneum, and also promote the penetration of fragrances, colorants and preservatives, which can easily cause allergic reactions. In addition, dry sensitive skin should not use skin care products containing fruit acids, vitamin A acid, whitening and sunscreen ingredients. Oily skin Pay attention to oil control and moisturizing The sebum film formed by the natural secretion of oil is a natural cream, but oily skin does not mean that the skin has enough moisture, the stratum corneum is still at risk of dehydration, the skin still continues to age. For those with oily skin, a non-soap cleanser with a medium level of oil removal is preferred. Moisturizers should be chosen with low viscosity and consider using oil conditioning ingredients at the same time. For daily maintenance, you should choose products that contain antioxidants and have sun protection. In addition, oily skin is generally oil secretion, and often mixed with sweat, metabolic waste, easy to make the skin contaminated by germs or oxidation and acidification, but also can lead to dermatitis, trichinosis and other skin diseases, so skin cleaning is very important, but cleaning cleansing can not be too frequent, once a day can be, because the body has enough self-regulation function.