When summer comes, using sunscreen is very important to protect your skin from the harmful effects of the sun. Sunscreen can help prevent skin cancer and skin aging. However, choosing the right sunscreen is very important to ensure skin protection.
There are many types of sunscreen on the market with different SPF ratings. SPF stands for Sun Protection Factor; this index measures the sunscreen ability of the cream. If you have sensitive skin or are prone to sunburn, you would choose sunscreen with a higher SPF. In addition, it is neccessary to note that using sunscreen is only part of protecting the skin from sun damage. You should also avoid going out during intense sunlight and wear a hat and sunglasses to protect your eyes and skin.
Nguyên Tắc Cơ Bản Của Kem Chống Nắng
Bảo Vệ Từ Tia UVA Và UVB
Khi mua kem chống nắng, bạn cần chú ý đến khả năng bảo vệ của nó khỏi tia UVA và UVB. Tia UVA có thể xâm nhập sâu vào da, gây hại cho collagen và elastin, dẫn đến lão hóa da. Trong khi đó, tia UVB là nguyên nhân chính gây cháy nắng và ung thư da.
Chỉ Số SPF
Chỉ số SPF (Sun Protection Factor) là một chỉ số cho biết khả năng bảo vệ của kem chống nắng khỏi tia UVB. Chỉ số SPF càng cao, thì kem chống nắng càng hiệu quả trong việc bảo vệ da của bạn. Tuy nhiên, không có kem chống nắng nào có thể bảo vệ hoàn toàn khỏi tia UVB.
Loại Dầu Và Loại Không Dầu
Kem chống nắng thường có hai loại: loại dầu và loại không dầu. Loại dầu thường có khả năng bảo vệ da khỏi tia UVB tốt hơn loại không dầu, nhưng nó có thể gây kích ứng và tắc nghẽn lỗ chân lông. Loại không dầu thường được khuyến khích cho những người có da nhạy cảm hoặc da mụn.
Khi chọn kem chống nắng, bạn cần chú ý đến các yếu tố trên để bảo vệ da của mình khỏi tác động của tia UV.
Basic Principles of Sunscreen
Appropriate Time to Use
Using sunscreen at the right time is neccessary to ensure it’s effectiveness. Sunscreen should apply at least 15 minutes before sun exposure.
If you are indoors and not exposed to the sun, there is no need to use sunscreen.
Additionally, sunscreen should use when exposed to the sun throughout the year, not just during the summer. Sunlight can harm the skin, even on rainy or cloudy days.
Correct Amount of Sunscreen to Use
To ensure the effectiveness of sunscreen, you need to use the right amount of cream. According to experts’ recommendations, you should use about 2mg of sunscreen per cm2 of skin.
If you use too little sunscreen, it is not enough to protect your skin from the effects of the sun. If you use too much sunscreen, it won’t penetrate the skin and can cause it to feel greasy and uncomfortable.
Therefore, it is necessary to measure the amount of sunscreen to ensure the best skin protection.
Popular Types of Sunscreens
Chemical Sunscreen
Chemical sunscreen is a type of sunscreen that contains chemical compounds that help absorb UV rays before they can harm the skin. These compounds include oxybenzone, avobenzone, octisalate, octocrylene, homosalate and octinoxate.
Some benefits of chemical sunscreens include:
- Easily absorbed into the skin
- Contain ingredients that help moisturize the skin
- May have a higher SPF than physical sunscreens
However, some people may experience skin irritation or dislike the sticky feel of chemical sunscreens on their skin.
Physical Sunscreen
Physical sunscreen contains ingredients such as zinc oxide and titanium oxide, which help reflect UV rays before they harm the skin. These sunscreens recommend for people with sensitive or easily irritated skin.
Some benefits of physical sunscreens include:
- Do not irritate the skin
- Do not penetrate the skin and clog pores
- Be able for children and adults with sensitive skin
However, physical sunscreens can feel thick or white on the skin because the physical ingredients do not penetrate the skin like chemical ingredients.
In choosing the right sunscreen for yourselves, you need to consider factors such as skin type, activity and environment to ensure maximum protection for the skin.
Side Effects of Sunscreen
Skin Reaction
Although sunscreen is an neccessary product to protect the skin from the harmful effects of UV rays, it can also cause some unwanted skin reactions. Some common skin reactions when using sunscreen include:
- Skin irritation: Skin may become red, itchy, or peeling after using sunscreen. It may be due to ingredients in sunscreen causing allergic reactions or skin irritation.
- Acne: Some sunscreens can cause acne, especially for people with sensitive or acne-prone skin.
- Darkening of the skin: Using sunscreen can make your skin darker. It may cause by ingredients in sunscreen.
Impact on the Environment
In addition to its impact on the skin, sunscreen can also on the environment. Some ingredients in sunscreen can cause environmental impacts, such as:
- Impact on coral reefs: Some ingredients in sunscreen can cause impacts on coral reefs and the organisms living in them, causing degradation of the marine environment.
- Impact on animals: Some ingredients in sunscreen can cause impacts on animals, especially those living in aquatic environments. These components can cause degradation of ecosystems.
Therefore, when using sunscreen, you should choose products with natural ingredients and do not impact the environment.
Conclusion
After researching and evaluating different types of sunscreen, we can conclude that sunscreen is an neccessary part of protecting the skin from the harmful effects of UV rays. Here are some points to pay attention to when using sunscreen:
- Use sunscreen with a minimum SPF of 30 to ensure skin protection.
- Apply sunscreen about 15 minutes before going out in the sun to allow the skin to absorb the cream.
- Reapply sunscreen every 2 hours or after swimming or sweating heavily.
- Use sunscreen containing oxybenzone and octinoxate with caution if you have sensitive skin or allergies.
- Avoid exposure to the sun’s rays during midday when UV rays are strongest.
In addition, using sunscreen is only part of skin protection. To have healthy skin, we should take other protective measures such as wearing hats and coats and avoiding exposure to sun rays at midday.
