Reviewer of this article: Zhou Xiaobo, Doctor of Medicine, Shanghai Jiao Tong University It's summer now The hottest season of the year This is also when the ultraviolet rays are strongest. Copyright image, no permission to reprint To protect your skin from damage I believe that many beautiful ladies I started paying attention to sun protection early on. Copyright image, no permission to reprint I don't know if you have such questions. Some people's skin becomes darker when exposed to the sun Some people's skin turns red when exposed to the sun. Why is this? Come and see … turn out to be There are two types of UV rays that can damage your skin —— UVA and UVB UVA is a long wave Strong penetration Mainly damages the dermis of the skin The culprit for sunburn Copyright image, no permission to reprint UVB ultraviolet rays belong to the medium wave Mainly damages the skin surface When this light reaches the surface of the skin Although it does not have the penetration of UVA to reach the inner part of the skin But the damage is also very strong Causes dermal blood vessels to dilate in the irradiated area This will cause the skin to turn red. In addition, it will stimulate melanin Let the skin slowly change from red to brown Copyright image, no permission to reprint In simple terms UVA ultraviolet rays will make people darker UVB will make people more red. The pictures and cover pictures with the China Science Popularization watermark in this article are from the copyright gallery. The pictures are not authorized for reprinting. |
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