Hello, summer. Cue hot days at the beach, the pool, the park, or a classic backyard barbecue. Another unforgettable and less enjoyable staple of summer? More sweat. You may feel like those sweat-drenched shirts and sweat stains are an embarrassment, but sweating actually serves a purpose. "The primary reason we sweat is thermoregulation, the control of body temperature," explains Brian Ginsberg, MD, board-certified dermatologist at Chelsea Skin & Laser, and clinical assistant professor of dermatology at Mount Sinai Hospital in New York City. "When we get too hot, sweating helps to cool the body down," he says. While sweating also helps to hydrate the skin and maintain our fluid-electrolyte balance, according to Dr. Ginsberg, the end result—those wet patches all over your body—can cause embarrassment and discomfort.

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