The summer weather is hot, and for people who love traveling and outdoor activities, if they don’t take good sun protection measures, they will easily get sunburned and tanned by UV rays, and have problems such as hyperpigmentation and increased pigmentation, and even cause solar dermatosis. Therefore it is crucial to do a good job of sun protection measures. A, the skills to apply sunscreen skin care products in order to allow the skin to get effective protection, sunscreen cosmetics are essential summer skin care products, but the use of sunscreen products but there are many skills, improper handling will affect the sunscreen effect. 1, sunscreen index (SPF) selection sunscreen index is an important indicator of the choice of sunscreen products, the choice of sunscreen index has a great relationship with the environment. Daily life and work, the general choice of SPF12 ~ 15, if you are only in contact with the sun on the way to and from work office workers, choose SPF15 or so sunscreen is appropriate; if you want to swim, outdoor activities, then you should choose SPF30 or even higher waterproof sunscreen, but the need to use special skin cleansers for cleaning when removing makeup; for photosensitive people, it is best to use SPF12 ~20 sunscreen. In addition, fair-skinned people are more prone to sunburn, not easy to tan, consider SPF value is the main; dark-skinned people, easy to tan, not easy to sunburn, consider PA value is the main. 2, the best sunscreen effect sunscreen should be applied about half an hour before going out, and it is best to reapply once more when going out, so that the skin can be effectively absorbed to achieve the effect of sun protection. Generally speaking, the dosage of 2mg/cO can achieve the best isolation effect. You should also avoid going out during the most sunny hours (10:00am to 2:00pm). Also make good use of various auxiliary products such as sun umbrellas, sun hats, sunglasses, light-colored cotton long-sleeved clothes, etc. to achieve the most comprehensive sun protection effect. We all know that sunscreen products are less effective after several hours of application on the skin due to dilution of sweat and other reasons. Therefore, it is necessary to reapply every 2-3 hours. When reapplying, you need to pay attention to first wipe the sweat and oil on your face with a clean tissue, and if you are a particularly vigorous oil secretion wipe, it is best to use wet tissue or use a hydrating spray, and then reapply. 3, choose the right sunscreen for your skin type oily skin should choose a strong penetrating lotion water sunscreen; dry skin should choose a cream sunscreen containing more oil; sensitive skin is best to choose the right sunscreen under the guidance of a cosmetic dermatologist. Second, avoid eating photosensitive food photosensitive food such as cilantro, celery, white radish, leek, etc., will aggravate the skin spots, should try to avoid eating. The shark fin, eel, winter melon, cherries, tomatoes, bananas, watermelon and tendons are excellent sunscreen foods, and more can be eaten to take in moisturizing and sunscreen ingredients. Third, after-sun repair if not coincidentally let the sun sunburn, available ice milk liquid (milk and water 10:1) every 3-4 hours wet compress, 15-20 minutes each time, or cold spray, wet compress, and pour cold film, soothing, calming the skin, with the use of soothing, moisturizing skin care products. Special attention should be paid to not doing massage, whitening, spot removal and other treatments for at least two weeks after sunburn. If the sunburn is serious, you should go to a regular dermatological professional clinic in time to receive medical treatment. *What is the effect of UV on the skin? UV is divided into long-wave UVA, medium-wave UVB and short-wave UVC, and the main damage to human skin is long-wave UV (also known as tanning section) and medium-wave UV (also known as red section). Long-wave UVB can reach the dermis, which not only stimulates the synthesis of pigments to “darken” the skin, but also is the main factor causing photoaging and fine lines. Medium-wave ultraviolet radiation, the transmission capacity of the epidermis, can cause erythema, erythema about three days gradually darkened. The SPF is the sun protection index, which refers to the sun protection index of sunscreen products against UVB. The SPF value objectively reflects the size of the product’s ability to protect against UVB. PA refers to the indicator of sunscreen products protection against long-wave UVB, there are PA (effective), PA (quite effective), PA (very effective). SPF and PA are marked at the same time, only to indicate the effectiveness of their respective sun protection, and no mutual reference value. Do not blindly pursue too high sun protection indicators, the higher the SPF and PA value, the greater the risk of skin irritation and allergic to sunscreens.