Most of us are making serious mistakes when using sunscreen

It turns out that most of the time, most did not apply enough cream. And the consequences may be more serious than you think.

Ask all the beauty experts and dermatologists in the world to see what is the first thing you need to do before you go out on the street during the day? Definitely apply sunscreen.

Sunscreen has a protective layer that prevents UV rays (ultraviolet rays) in sunlight. Not only does it make skin healthier and more beautiful, it also avoids our risk of skin cancer, because UV rays are a powerful cancer agent.

However, according to a recent study, there is a very worrying fact that most of us are applying sunscreen wrongly .

Most of us are applying sunscreen the wrong way.

How is the protection capacity of sunscreen prescribed?

All are based on the SPF (sun protection factor) index . The higher the SPF, the better the ability to prevent UV rays.

The first sunscreen came out in the middle of the 19th century. And know what, its SPF is only 2.

Six decades later, science has made remarkable progress. We have water-resistant sunscreen, have a spray cream, and the lifetime is much longer. And even, there are creams with an SPF of up to 100.

Most of us only get about 40% of the protection that sunscreens really bring.

Only according to research by King's College London, in all these years, almost all of us have used the wrong way.

In fact, everyone knows that it is necessary to apply sunscreen to all parts that are exposed to light. But the problem is the thickness of the ice cream , so many people are doing wrong. According to research, most people receive only about 40% of the protection that sunscreens actually bring.

" We used too little amount of sunscreen needed, " said Antony Young, a professor of photomechanics, research author. "For example, if you use ice cream with SPF20 but only apply it at a thickness of 0.75mg / cm ² , the protective effect is just as good as SPF4."

This is a really scary result. Many previous studies have shown that exposure to ultraviolet rays - even small ones - can cause skin damage and increase the likelihood of cancer formation.

Exposure to the sun will make the skin more serious.

According to Professor Young, the number needed is about 2mg / cm ^{2 of} skin. It's a little hard to imagine, but it falls into about twice as much as you usually do. In addition, each part of the body needs a different amount of cream.

Also, theoretically, sunscreen with SPF15 is enough to protect you from the sun. However, the actual sunshine has a different density of ultraviolet rays according to time and place, plus the fact that we apply the cream incorrectly. So for safety, we should use cream with SPF of 30 or more.

The study was published in the journal Acta Dermato-Venereologica.