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Why do sunburns feel like burning flesh?

Well, it is because they are burning, but not in the sense you’d expect. When the UV rays affects and damage the cells of the outer layer of the skin the body starts pumping blood in that area to start the healing process. That healing process generates heat and will eventually heal the cells or allow them to be exfoliated.

Remember: the sunburns burn because the body reacts to the damaged cells by pumping blood and using other cells to rebuild the skin.

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