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01UV rays can penetrate through the fabric
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A cotton mask can offer protection of only up to SPF 7. UV rays can easily penetrate through the fabric and cause problems like pigmentation, sun spots, premature ageing and more. Irrespective of whether you're wearing a mask indoors or outdoors, you will still need to wear SPF. A lot of glass windows do not block UVA rays, which are quite harmful to the skin.
02Prevents tan lines
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Skipping sunscreen may end up making you look like a racoon. When parts of your face are exposed to the sun while others are hidden under the mask, chances of you developing prominent tan lines are higher. As a general practice and good skincare habit, slather on sunscreen all over your face as you normally do, without skipping the area that will be under the mask.
03Some parts are still exposed to the sun
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As you are well aware, some parts of your face are still exposed to the sun. To stay protected from sun damage under the mask, it is best to apply a broad-spectrum sunscreen with a matte finish like the Ponds Sun Protect Non-Oily Sunscreen SPF 50 to prevent a greasy mess.

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