You’re watching a suspenseful movie when suddenly the hairs on your arms stand up, your skin prickles with tiny bumps, and a shiver runs down your spine. Or maybe you’re standing outside on a chilly ...
Goosebumps occur when the arrector pili muscles cause the hairs to stand up, making the skin look bumpy. A person may notice goosebumps on the arms, legs, or trunk. When the hairs stand up on the skin ...
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