In addition to natural aging, there is another important factor in skin aging – photoaging. UV rays are everywhere, so sun protection has become a must-do task for ladies every day, because the damage caused by UV rays to the skin is not simply a tan, it can also harm your skin, leading to sunburn and skin aging. So, today we will explain the hazards of UV rays and how to do a good job of sun protection? The three main hazards of ultraviolet light, more terrible than tanning The sun in addition to bringing light and vitality it will also cause damage to the skin. In addition to making you tan, sunburn, there may be sun health problems of the skin! 1, skin aging: too much exposure to ultraviolet light on the skin will increase melanin synthesis, which can lead to pigmentation, such as dark spots, freckles, chloasma and other kinds of pigmentation increase, increase, become deeper. 2, solar dermatitis: In summer, many small rashes will grow on the face, neck and arms, as long as they are exposed to the sun, which is likely to be polymorphic sun rash caused by UV allergy. This group of people is particularly important to protect themselves from the sun, otherwise the itchy skin will also lead to discoloration and skin keratinization. 3, skin malignancy: This is not an alarming story, why skin cancer is highly prevalent in western countries, in addition to their ethnicity, there is also an important factor is that they like the sun too much! Long-term exposure to UV radiation can lead to solar keratosis, which is a kind of early skin cancer, and improper protection may also induce squamous carcinoma, basal carcinoma, and even lethal melanoma. UV rays can induce keratinocyte proliferation, leading to skin hypertrophy, sagging, roughness and wrinkles, capillary dilation, and erythema. It also decreases the immune function of the skin and can lead to skin cancer or precancerous lesions. Therefore, the key to protecting skin, preventing skin aging and preventing skin cancer is to prevent the damage of UV rays in the sun. So for the health of your skin remember to protect yourself from the sun! Sun protection! Sun protection! It’s important to say it three times. UV rays exist at all times and in all places, only the intensity is different. If you usually only sunscreen in the sunny summer, then your skin may have been damaged by UV rays a thousand times, so sunscreen is a daily skin care must. The actual type of sunscreen 1, physical sunscreen As the name implies, it is the use of physics to protect against the sun. The atomic particles of this sunscreen are flaky, and when applied on the face, it is like a mirror, reflecting the sunlight and achieving the purpose of sun protection. Titanium dioxide and zinc oxide are two minerals that absorb UV rays. The finer and more uniform the particles of titanium dioxide and zinc oxide, the better the sunscreen effect and the better the transparency of the sunscreen product. If the particles in a skin care product are large, and the large particles have the effect of scattering visible light, they will appear whitish when applied to the skin. And the finer the particles of minerals are, the more they will coalesce together. Nowadays, titanium dioxide and zinc oxide have been increasingly used in sunscreen skin care products. This sunscreen will not be absorbed by the skin and generally does not cause allergies. 2, chemical sunscreen Use the principle of absorption to sunscreen, often light-transmitting substances, can absorb ultraviolet light, so that it is converted into molecular vibration energy or heat to achieve the effectiveness of sunscreen. After applying to the face, atoms absorb sunlight to prevent the sun from touching the skin. The most common UV chemical absorbing substance is PABA (para-aminobenzoic acid). This type of sunscreen is not recommended for sensitive skin and infants. Pick a sunscreen and identify the logo on the sunscreen The UV rays that cause skin tanning and sunburn are the UV rays that can penetrate the atmosphere to reach the surface of the skin in two ways: UVA and UVB. UVA: can penetrate the dermis and damage the collagen and lipids in the skin, which is the main reason why we get tanned and develop pigmentation. UVB: can make our skin red and peel, and is the killer of sunburn. The sun protection index (SPF value) indicates the index that can resist medium-wave ultraviolet rays (i.e. UVB), and the PA value is the index that indicates the index that can resist long-wave ultraviolet rays (i.e. UVA ), and the testing methods for the two are not consistent, so the two indices are not interchangeable. The more “+” behind the PA, the stronger the sunscreen’s ability to prevent tanning. The more “+” behind the PA, the better the ability of this sunscreen to prevent tanning and sunburn. Not the higher the SPF value means the better the sun protection. “The higher the SPF value, the more UV absorbers and scattering agents are inside the sunscreen, the greasier and heavier it is, The higher the SPF, the more UV absorbers and scattering agents inside the sunscreen, the greasier and thicker it is, and the more likely to cause skin allergies. So to consumers according to their age, the nature of their work, habits, body sweating, skin condition, skin tone shades, skin photosensitive reaction, etc., choose a different SPF sunscreen. General type of skin people, indoor office workers SPF value in 15 can; in the field, seaside and outdoor workers, SPF value should reach 30 or more. Many people think that the higher the SPF value of the sunscreen, the more sun protection, in fact, the higher the SPF value of the sunscreen, the higher the sunscreen ingredients contained – UV antagonists, which in turn interferes with the normal whistling and metabolism of the skin, easy to ho into the hand hole Yangsei, oily skin. The actual fact is that you can find out how to apply sunscreen to be useful Some people will say that I rubbed sunscreen, why is it still tanned and sunburned? The sunscreen is good again, the usage is not right is also blind, the following look at the sunscreen use method. 1, master the time to apply sunscreen and general skin care products, not applied on the effective, but need a time to be absorbed by the skin therefore, should be applied in the 20 minutes before going out of the sunscreen. 2, apply the appropriate amount of sunscreen usually applied to the skin amount of 2 mg per square centimeter, in order to achieve the proper sunscreen effect. So not coated on it, to reach a certain amount to play the effect, so the amount must be enough. 3, different skin types buy different Before buying sunscreen, first in the inner wrist smear test, within 10 minutes if the redness, swelling, pain, itchy phenomenon, indicating that the skin has an allergic reaction to this sunscreen, you can choose a lower sun protection index products. Oily skin and face with acne, should choose a strong penetration of water-based, oil-free formula sunscreen, after using a fresh, non-greasy, non-clogging pores. 4, timely reapplication Even if the waterproof sunscreen, in the case of sweating is easy to fall off. If you are active for a long time, you have to reapply every 2 hours or so. 5, about makeup removal Sunscreen to remove makeup, see the label on the package will know. The lighter “chemical sunscreen”, directly wash off with a cleanser can be. And physical sunscreen, waterproof sunscreen is easy to remain on the surface of the skin, you need to carefully remove makeup, so as not to add burden to the skin.