Received a "letter for help" "Hello, I have a question. My skin has never been white since I was a child. The black one will get darker after sun exposure. Is there any way to whiten it?"

Tanning and whitening have always been a hot topic, which cannot escape the problem of sun protection. It is midsummer now, and sun protection is the most important thing. Today, I will introduce you to those things about sun protection.

How long does it take for my skin to turn white after tanning?

If the human skin is exposed to excessive ultraviolet rays, it will become rough and dark, and even cause cell mutation and induce skin cancer.

And our body is not without defense measures, it will start the self-protection mechanism, the melanocytes in the body will secrete melanin, which will be transported to the keratinocytes, and the Chinese medicine ingredients covered in the cells will protect it from ultraviolet rays.

"But if you bask in the sun, it is inevitable that the skin will turn black. If you want to turn white, it will take some time. You need to wait until these melanin-containing epidermal cells fall off and new epidermal cells form before the skin turns white.

Generally speaking, the metabolic cycle of skin epidermal cells is about 4 weeks, so after excluding the possibility of some other factors, it will take at least 1 month to turn white.

According to this principle, we can also find that the key to whitening is to produce melanin, and the shedding of melanin epidermal cells takes time, so even if you use whitening products, it is impossible to turn white within a few days.

If it turns white in a short time, it is likely to contain lead minerals or hormones. Although the surface looks white, it will also damage the skin and bring more skin problems, so everyone should be careful.

Don't want to be tanned, it is very important to do sunscreen work in advance, and this must be kept in mind!

Don't want to be tanned, keep the three whitening lines of defense

Strictly speaking, sun protection is the most basic part of skin care steps. If sun protection is not done well, the skin will not be well. Our sunscreen is mainly to avoid ultraviolet rays in the sun, with UVA and UVB having the greatest impact.

Excessive exposure to UVA is prone to photoaging, dry skin, roughness, and fine lines. Excessive exposure to UVB can easily cause sunburn such as skin redness and peeling.

Both types of UVB radiation damage the DNA of skin cells, which in turn may induce skin cancer.

So, sun protection is very important! In particular, it is necessary to do a good job in these three aspects.

Sunscreen:

Since the sunscreen ingredients in sunscreens are absorbed by the skin, it takes a certain amount of time to combine with the proteins in the skin to absorb UV rays, so it is recommended to apply them half an hour before going out.

Try to avoid going out during the time when the ultraviolet rays are the strongest, that is, go out less between 10:00 and 14:00. If you must go out, remember to "arrange" physical + chemical sunscreen.

Wear a sun hat (with a brim width of at least 7.5 cm), sunglasses, and sunscreen (UPF>40, UVA transmittance <5%, dark clothes with the highest sunscreen), bring an umbrella, and apply sunscreen at the same time; if yes Swimming and other underwater activities, pay attention to the use of waterproof sunscreen.

In summer, the ultraviolet rays are relatively strong, so try to choose a sunscreen with an SPF value greater than 30. Sunscreen must be applied in sufficient amount and repeatedly on all the skin parts that are to be exposed to the sun.

For better sun protection, you can usually eat more foods with sun protection, such as lemon, which contains vitamin C, which can promote metabolism, relieve skin aging, whiten and lighten spots, and have the effect of skin care and sun protection; and tomatoes help to slow down the skin. Collagen is destroyed by UV rays, thereby helping sunscreen.

Remove:
Don't forget to apply sunscreen when you go out, but don't forget to remove your makeup when you get home, otherwise the excess oil will easily clog the pores and cause skin problems such as acne and pimples.

In general, ordinary sunscreens can be washed off with facial cleansers, but if it is a waterproof, greasy sunscreen product, you need to use a makeup remover.

Clean:

Sun exposure is also a key to skin care. Be sure to do a good job of cleaning. Don't rush to wash your face with cold water immediately after sun exposure, but wait until the body surface temperature drops to normal before washing, but at the same time, be careful to avoid excessive washing.

If your skin is smooth and not tight after cleansing, it's just right, if your skin is tight and dry, you're probably over-cleaning. After cleaning, you should pay attention to moisturizing, and choose protective products according to your skin condition. For example, dry skin can choose moisturizing type, and oily skin can choose refreshing type.

Pay attention to these points when applying sunscreen: Do an accurate skin test before purchasing sunscreen, and read the ingredient list when purchasing, and pay attention to whether it contains allergenic ingredients.

When buying sunscreen, don’t just look at the SPF index. Although this is an important indicator for judging sun protection, it does not mean that the higher the value, the stronger the sun protection. The most important thing is to apply sunscreen correctly.