Why Does Your Skin Peel After a Sunburn? It's on Purpose

Why does your skin peel after a sunburn? Because damaged skin cells get an order to self-destruct, on purpose. This is how sunburn works from the inside, from UVB welding your DNA to the sunburn cells p53 tells to die. We follow the war against ultraviolet light through five orders: the damaged-RNA alarm, the widening blood vessels that turn skin red, p53's repair-or-die decision, the sunburn cells that self-destruct, and the rebuild that makes sunburned skin peel in sheets. Then we look at how a tan forms, why the self-destruct switch is far older than humans, and three sunburn myths about base tans, clouds and snow. 00:00 Why your skin peels after a sunburn 00:44 The war against UV light: UVA vs UVB 01:24 Your skin's outer wall: keratinocytes and melanocytes 01:53 How UVB welds your DNA 02:45 Why sunburn isn't a heat burn 03:05 Order 1: the damaged RNA alarm 03:36 Order 2: why sunburned skin turns red 04:07 Order 3: p53 checks the DNA damage 04:26 Order 4: sunburn cells self-destruct 05:20 Why a sunburn is a sacrifice 05:38 Order 5: why skin peels in sheets 06:11 How a tan forms, and who orders it 07:13 Evolution: an ancient self-destruct switch 07:41 Why human skin color is a trade-off 08:15 Sunburn and skin cancer: when the guardian fails 08:50 Sunburn myths: base tans, clouds and snow 09:16 What scientists still don't know 09:40 Back to the peel Sources: https://pubmed.ncbi.nlm.nih.gov/7997263/ https://pubmed.ncbi.nlm.nih.gov/22772... https://pmc.ncbi.nlm.nih.gov/articles... https://pmc.ncbi.nlm.nih.gov/articles... https://pubmed.ncbi.nlm.nih.gov/9856805/ https://pmc.ncbi.nlm.nih.gov/articles... https://pubmed.ncbi.nlm.nih.gov/17350... https://pmc.ncbi.nlm.nih.gov/articles... https://pubmed.ncbi.nlm.nih.gov/6721522/ https://pubmed.ncbi.nlm.nih.gov/16215... https://pmc.ncbi.nlm.nih.gov/articles... https://pubmed.ncbi.nlm.nih.gov/24876... https://pubmed.ncbi.nlm.nih.gov/10896... https://www.who.int/news-room/questio...) https://www.nhs.uk/conditions/sunburn/ Narration voice: Qwen3-TTS (synthetic). All animation, music and sound are original. This video explains physiology and is not medical advice. #sunburn #skin #humanbody