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Five points of knowledge about sunscreen

You probably know that you need to wear sunscreen when you're lying on the beach. However, dermatologists recommend that we use sunscreen at all times, even in the winter, and that you should apply it for 20 minutes or more, even on cloudy or rainy days. Because the ultraviolet rays of the sun (ultraviolet) can start causing skin damage in as little as 15 minutes! This damage can even lead to skin cancer. This damage can even lead to skin cancer. This is why sunburn prevention is always better than treatment.
Look at the SPF value." SPF" refers to the "sun protection factor" of a sunscreen, or how effectively it blocks UV rays. the SPF reflects how long you get sunburned when you use sunscreen versus when you don't.
For example, an SPF of 30 means that you spend 30 times as much time in the sun as you would without any sunscreen.
The SPF number can be tricky because its protective effect does not increase proportionally. Therefore, SPF 60 is not twice as effective as SPF 30. SPF 15 blocks about 94% of UV rays, SPF 30 blocks about 97%, and SPF 45 blocks about 98%. No sunscreen can block 100% of UV rays. If you're going swimming or sweating, choose an SPF 50 sunscreen.
SPF refers only to the ability to block UVB rays that cause sunburn. However, the sun also emits UVA rays. UVA rays can cause skin damage such as signs of aging, wrinkles and dark or white patches. Both of these rays can increase your risk of skin cancer.
Some sunscreens may not state "broad spectrum" on their packaging. But most broad-spectrum sunscreens contain "inorganic" ingredients, such as titanium dioxide or zinc oxide, as well as "organic" sunscreen ingredients, and you can rely on this to tell the difference
 
Because your body expels water through sweat, you'll want to look for a sunscreen that is waterproof. This is especially important if you run or hike a lot, or if you will be in the water.
 
4. What type of sunscreen do you prefer
Some people prefer a spray-on sunscreen, while others prefer a thick cream or gel. Whatever you decide, make sure you apply it thickly and evenly. The method of application is as important as the SPF and other factors: if you don't apply it correctly, the sunscreen won't do its job
 
5. Prevent allergies
When you get home, try a small amount on your wrist. If you see any allergic reactions or skin problems, buy a different sunscreen. Repeat this process until you find the right sunscreen, and if you have sensitive or allergic skin, ask your doctor for a recommended brand. Itching, redness, burning or blistering are all signs of an allergic reaction. Titanium dioxide and zinc oxide are unlikely to cause an allergic skin reaction.
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