Everyone has a love of beauty. Whether the skin is in good condition or not largely determines a person’s color value.
Before the article starts, let’s look at the following two pictures and guess how old are the left and right respectively?
The answer is… this is the same person, the same face at the same age, and the above picture is a mirror image of the left and right faces respectively.
This photo comes from the famous medical journal < >. The old man in it is a driver who has worked for 28 years. Why is there such a big difference between his left face and his face?
Because of the sunshine.
Sunshine can not only tan, but also age.
Photoaging caused by sunlight is the main cause of skin aging.
When sunlight shines on the skin, the ultraviolet rays can penetrate 4 ~ 5 mm deep into the skin, which will not only form various oxidative free radicals and destroy collagen synthesis, but also lead to skin cell death, cell DNA damage, etc., eventually causing premature skin aging, wrinkles, relaxation, and even increasing the risk of skin cancer.
Among them, UVA and UVB are the most harmful ultraviolet rays to human body:
- UVA has strong penetrating power, can penetrate into dermis layer, stimulate melanin increase, lead to skin tanning, color spots and wrinkles; UVB has high energy, which can cause immediate skin sunburn, sunburn, erythema, blisters, pain and other problems.
In short, if you want to stay young, you must protect yourself from the sun.
Sun protection should not only focus on summer, but also on rainy days all the year round.
The sun shines brightly in summer, and many people can’t stand the sun, so they think of sun protection.
It is true that on days like [summer + sunny days], ultraviolet rays are the strongest and do the greatest damage to the skin, but ultraviolet rays at other times cannot be ignored.
For example, in rainy days when there seems to be no sunshine, the intensity of ultraviolet rays can actually reach about 70% of that in sunny days.
Therefore, although the sun is not so dazzling in spring and autumn, the intensity of ultraviolet rays is still quite high. If you always wait for summer to come before thinking of sun protection, your skin has actually been hurt by a lot of ultraviolet rays.
Indoors, sun protection cannot be ignored.
Some people may have doubts:
I work indoors every day, through the glass, don’t I need sun protection?
This is… Not necessarily.
The most common thing in our daily work and life is flat glass, which is composed of sodium calcium silicate and can indeed block most short-wave ultraviolet rays.
But! There is still a small part of UVA1 (340 ~ 400nm) with strong penetrating power that can penetrate.
In addition to ultraviolet rays, a large amount of infrared rays can also pass through the glass, which can also cause skin capillaries to dilate and erythema.
If your work position is near the window, it will still cause skin damage over time. The example of the driver is a good proof.
Having said so much about the harm of sunlight to skin, then the problem arises…
What should I do to protect myself from the sun?
Sunscreen is very important, but this does not mean that we must wear sunscreen 365 days.
Because sun protection can be divided into [hard sun protection] and [soft sun protection] two categories:
- Hard sunscreen refers to the use of sunscreen clothing, sunscreen umbrellas, sunshade hats, masks, long-sleeved underwear, etc., where there is sunlight to cover, directly shielding the direct radiation of ultraviolet rays; Soft sunscreen refers to the use of sunscreen or cosmetics containing sunscreen to cover the skin in all directions and protect the skin from ultraviolet rays.
The specific way to choose can be judged according to one’s own situation.
For example, you can wear masks and hats to protect yourself from the sun when you go out in winter, but it is better to wear sunscreen or sunshade in summer. Learning to drive, then… put on sunscreen, put on hats, sunglasses and masks, and cover them tightly.
If you really don’t know which one to choose, there is a simple method to refer to: look at the ultraviolet index.
Take a look at the ultraviolet index before going out, and you will probably know that you should choose how’s sunscreen method.
Of course, the ultraviolet index is only a reference. How to do it depends on the actual situation of the individual.
However, there are several key points that we must pay attention to:
- To buy sunscreen clothes or umbrellas, check UPF value (> 40); When buying sunscreen, pay attention to SPF value and PA value. The sunscreen must be applied in sufficient amount and used at the dosage of 2 mg/cm2. The face needs about the size of a dollar coin. It is better to apply sunscreen every 2 ~ 3 hours to ensure that it is evenly distributed on the skin surface.
In short, if you want to have good skin, please start with serious sun protection and never be lazy.
Please remember, no matter how good or expensive the whitening, wrinkle removal and anti-aging essence is, it can’t be compared with the speed of suntan and aging.