Why do some people get tanned and others get red from the same sun? How to prevent sunburn in summer?

Now is the hottest summer of the year, but also the strongest ultraviolet rays, I do not know if you have ever had such an experience, a long time in the sun, the skin will become black, and some people's skin will be red. Why is this?

Caused by such a phenomenon are actually related to the sun, although the sun brings us light, but it also brings a special kind of light, is ultraviolet. Usually we live in the mention of sunscreen, in fact, to prevent is also ultraviolet radiation, and even in cloudy days, there is also the existence of ultraviolet radiation.

The same sunlight, why some people will be tanned, some people will be red?

Ultraviolet rays have two wavelengths, one is UVA and the other is UVB. the former can reach the deepest layers of the skin, even on cloudy days. In the surface layer of the skin, there are melanocytes, when the ultraviolet light into the skin, melanocytes will automatically start the protection mechanism, the release of complex, the blood also has the presence of complex, the two are combined with each other into a "dopaquinone" in the surface of the skin and the ultraviolet light to fight, so the skin will become black.

Obviously, UVA will lead to skin darkening, then UVB will lead to skin redness after sun exposure, this is because this is because UVB in contact with the skin, stimulate the keratinocytes, resulting in vasodilatation, blood flow increases, the skin will appear particularly red phenomenon. And UVB wavelengths can also enter slightly deeper skin, stimulate melanocytes, and then the skin red will deepen.

The two different wavelengths of ultraviolet light can be harmful to the body. UVA accelerates the growth of wrinkles and the aging of the skin, while UVB may cause skin cancer, and the skin is exposed to sunlight for too long, and the DNA in the skin cells will be damaged.

From this we know that the skin is irradiated by the sun after the black and red, in fact, and the wavelength of ultraviolet radiation, UVA will be tanned, UVB will be red, long time will produce damage to the body, so usually must pay attention to sunscreen, especially in the summer.

Do a good job of sunscreen, summer can be white to "shine"

Sunscreen practice is divided into two main types, one is chemical sunscreen, one is physical sunscreen.

Physical sunscreen, in fact, is to use clothes, hats, umbrellas and other items to block the sun, and can effectively block ultraviolet rays. Now there are special sunscreen clothing, if you choose sunscreen clothing is best to choose the sunscreen index of more than 40, UVA transmittance rate of less than 5%, and the effect of dark sunscreen clothing will be a little better.

Chemical sunscreen is sprayed with a variety of lotions and sprays, depending on personal feelings to choose, some people feel that the spray may not be in place to prevent the sun, so the choice of lotion; and some people feel that the weather is hot lotion on the face of the viscous will be very difficult to, so choose to spray. In fact, in addition to personal preference, the different seasons of the choice of sunscreen is also skillful.

Sunscreen points of attention:

The summer sun is even more poisonous, so remind everyone, in the morning at nine o'clock to four o'clock in the afternoon this time to minimize the outing, because this time is the strongest period of sunshine, if you do not do a good job of sunscreen measures, it is very easy to be tanned or even sunburned.

We all know that the main parts of the sun is the face and limbs, some time may forget some details of the parts, such as the neck, fingers, ears and other parts of the skin will be the same aging.

Although the daily attention to the problem of sunscreen, but also can not ignore the importance of the sun, is to help the body to supplement vitamin D. If the body lacks vitamin D, children may lead to rickets, adults may be more prone to fracture after exercise or collision, the elderly to accelerate the symptoms of osteoporosis, so the usual intake of vitamin D must be to ensure adequate.

And the sun is in addition to dietary supplements in addition to the direct access to vitamin D, so that in the focus on sunscreen at the same time, do not forget to appropriate sun, the body is good.

Summary: Whether it is tanning or sun red, UV rays are harmful to the body, if the daily prolonged exposure to sunlight, it is best to do a good job of sunscreen, sunscreen products to choose the safe and suitable for their own.