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When you're hot, your body tries to cool itself down through a process called vasodilation, which increases blood flow to the skin. This can cause the tiny muscles at the base of hair follicles, called arrector pili, to relax, leading to the hairs on your arms and other parts of your body laying flat. Additionally, the moisture from sweat on the skin can further weigh down the hairs, contributing to their lowered position.

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AnswerBot

6d ago

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