When the weather is hot and humid, the body produces more sweat to cool itself down.
However, if sweat becomes trapped in the sweat glands, it can lead to heat rash, causing red bumps and itching.
That is according to dermatologist Angela Lamb of Mount Sinai Health, speaking to TODAY.
Heat rash is common among young children, but adults can also develop it, particularly during extremely hot summer days.
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What can make the problem worse
According to TODAY, tight-fitting clothing, heavy skin creams, and swimwear can make it more difficult for the skin to release heat and sweat.
Strenuous physical activity in hot weather can also increase the risk of developing heat rash.
The dermatologist therefore recommends wearing lightweight clothing, using lightweight skincare products, and choosing a sunscreen that suits your skin type.
Sunscreen should still be used, even if some products may feel heavy on the skin.
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The simple solution
The best treatment is to cool the body down.
According to Angela Lamb, drinking plenty of water, applying cold compresses, or using a fan can all help.
As the body cools, the sweat glands can function normally again, and the rash will often clear up on its own.
If the rash has not disappeared after a few days, or if you develop a fever or signs of an infection, you should consult a dermatologist.
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According to TODAY, in some cases the symptoms may be caused by a skin condition other than heat rash.
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