Changes in daily sunscreen use

For girls, getting tanned is a very scary thing. As the saying goes, "A white complexion can hide three ugly features." Nowadays, the sun's ultraviolet rays are too strong, so people will choose to use sunscreen to protect themselves from the sun, or they can use an umbrella to protect themselves from the sun. However, since the effects of sunscreen or sun umbrellas are not very obvious, some people think that it is useless to insist on sun protection. In fact, it is useful.

Generally, sunscreens are marked with two indexes, PA and SPF. UVA in ultraviolet rays can cause skin tanning, and the PA value is an indicator of the extent to which UVA damage can be prevented. The PA values ​​of sunscreens on the market are usually divided into PA+, PA++, PA+++, and PA++++. The number of "+"s represents the ability to prevent tanning.

UVB in ultraviolet rays can cause sunburn. The SPF value represents the degree to which the sunscreen prevents UVB damage, that is, its ability to prevent sunburn.

How to choose the right sunscreen?

① For daily commuting, you can choose SPF20~25, PA+ sunscreen

②When you need to do outdoor activities, you can choose SPF30, PA++ sunscreen

③ When exposed to the sun for a long time, such as when going to the beach, you can choose sunscreen of SPF50, PA+++ or above.

Be careful about when to apply sunscreen

Sunscreen takes time to be absorbed and take effect, so it should be applied 20 to 30 minutes before going out. Even in winter, on cloudy days, and indoors, UV rays can still damage the skin. For example, on cloudy days, the intensity of UV rays will only decrease by about 30%.

Therefore, sunscreen should be used all year round, rain or shine.

How much sunscreen should you apply? Not enough paint = no paint

If sunscreen is applied too thinly, it will not be effective, but if it is applied too thickly, it will put a burden on the skin. If you want the sunscreen to evenly cover the skin surface and achieve the best protection effect, you need to apply 2mg/cm². The facial skin is about 450cm², so about 0.9g of sunscreen should be applied.

Simply put, it is the size of a one-yuan coin.

As for the arms and calves, which are often exposed to the sun, more lotion is needed, costing "three dollars".

Don't use expired sunscreen

Currently, sunscreens on the market are usually made by mixing two filters. Once expired, the two UV filters may separate, which means that the sunscreen will not be able to be evenly applied to the body surface, and even if the active ingredients have not deteriorated, it will not be able to effectively protect against the sun. In addition, expired sunscreen may breed more bacteria and irritate the skin.

If you want to stay young forever, start by applying enough sunscreen.