Recently, with the trend of the times, more and more people are pursuing “black”. However, some studies have found that women do not need sunscreen for ten minutes in the scorching sun, and the skin will be aging for 10 days in advance. What is even more terrible is that in the summer that seems proud and harmless, nearly 70 % of people have unknowingly growing their first wrinkles in life.
In addition, sunburn can cause DNA damage to the skin. To receive large -dose ultraviolet irradiation, secondary “epidemic melanoma” may occur, and the risk of skin cancer increases.
Sun protection has become imperative!
To this end, 39 Health Network invited Yan Qiuyue, director of the dermatology department of Shanghai Pudong Hospital, and asked her to talk about the relevant knowledge of skin sunscreen.
Before sunscreen, you may wish to know ultraviolet rays first
The exogenous factors that cause skin aging are ultraviolet rays and haze. Our common daylight is divided into Ultraviolet (UA, 180-400nm), visible light (400 ~ 760nm), and infrared (760 ～ 1800nm) according to the wavelength.
Among them, the main damage caused by our skin is ultraviolet rays, and it can be subdivided into short -wave UV (UVC, wavelength is 180-280nm), mid -wave ultraviolet (UVB, wavelength is 280-320nm), and long wave ultraviolet (UVA, wavelength is 320 is 320 is 320 ~ 400nm).
You know, the penetration effect of ultraviolet rays on the skin is wavelength dependence. The longer its wavelength, the deeper penetration. Among them, the amount of UVC was filtered by the ozone layer and reached the ground very small. UVA and UVB were the main spectrum of skin light damage and photosensitive skin diseases. UVB can reach the base layer of the epidermis, which can cause epidermal necrosis and darkness under strong exposure. UVA can penetrate the epidermis to the shallow layer of the leather, and exposed to UVA for a long time can cause skin light.
Therefore, if we do not do sun protection, long or high -intensity sunlight will have a great impact on the skin, such as common sunburn, sunburn and sunburn, skin aging, and various light diseases, etc. In severe cases, it can even cause skin cancer.
The sun will also expose the disease
Under normal circumstances, receiving long or high -intensity sunlight will produce the following situations:
Darkness and sunbathing are the protection mechanism of the body to avoid light damage, but it is also an inevitable result of UV’s skin damage. Therefore, it is not advisable to deliberately sunny. For everyone, the more black the sun shows the more damage to the skin.
The process of sunburn and sunburn is staged. The short -term adequate ultraviolet radiation appears erythema (immediately erythema), and then disappears, and then reproduces and lasts for several days (delayed erythema). Vascular permeability changes can cause blisters or edema. Skin desquamation appears in about a week. Once sunburn occurs, cold and wet compress immediately. The sunburn is easily ignored by everyone, but as long as it is avoided in the sun for a long time, and the correct sunscreen can be avoided.
The long -term effects of light and carcinogenic luminous sunlight include light aging and light carcinogenic. Sun exposure is the main reason for skin aging. Therefore, for beauty lovers, we should pay more attention to sun protection. In addition, UV exposure has proven to be one of the main risk factors for skin melanoma and non -melanoma skin cancer.
4 sunscreen methods to be remembered
In the various influences of sunlight on our skin, sun protection seems urgent.
Of course, many women will apply sunscreen before makeup to resist ultraviolet rays, but the sunscreen that protects the skin is actually likely to be dark as long as it is used for a little error.
Here, I will introduce several common sunscreen methods:
First, hide. When there is obvious sunlight radiation in the outside world, as at noon, we can stay in a cool place to reduce the exposure of our skin in the sun.
Second, topical sunscreen products. In most cases, it is recommended to apply sunscreen products with more than 15 SPFs. The SPF is the sunscreen index. It refers to the ratio of the minimum UVB amount (minimum erythema amount) that causes the minimum erythema reaction after applying sunscreen and the UVB amount of the same erythema when the sunscreen is not used. But at the same time, the higher the SPF value, the better the sun protection effect. When the SPF of the sunscreen products increases to a certain amount, the difference in sun protection ability is reduced. Although the sunlight is short -lived and repeated, it will not make people dry, but it is still encouraged to carry out daily ultraviolet protection. In particular, patients with sunburn, lighter skin tone, and photosensitive diseases should be better sunscreen.
The third step is to wear a protective clothing. When we need to receive long -term sunlight in external activities, in addition to we need to use sunscreen, we should also wear special clothes with the SPF logo to reduce the skin damage to the skin.
The fourth step is to properly supplement antioxidant supplements, such as vitamin C, vitamin E, vitamin A, etc.
<!-2528: Dermatology terminal page