Why Sweat and Heat Make Your Skin So Sensitive
Briefly

Your skin is your body's natural radiator, giving off energy when you get overheated via coil-shaped sweat-producing glands. If your body is sweating faster than your pores can get it out, the sweat gets caught underneath the skin, causing tiny, red, itching bumps known as prickly heat.
Certain areas like the back, lower thighs, waistbands, and places with occlusion are prone to developing prickly heat. While it's hard to completely avoid it in hot weather, wearing loose-fitting clothes, moving around, and taking cool showers can offer relief.
Read at time.com
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