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What Is Heat Rash? Heat rash is a skin irritation caused by excessive sweating during hot, humid weather. Heat rash looks like tiny bumps surrounded by a zone of red skin. Heat rash is also called prickly heat and miliaria. Where Does Heat Rash Occur? Heat rash usually appears on clothed parts of the body, such as the back, abdomen, neck, upper chest, groin, or armpits. Heat rash occurs most often in hot, humid conditions. However, heat rash may develop in cool weather if you are overdressed. What Causes Heat Rash? Heat rash is usually caused by overheating of the skin. The skin overheats when the pores are clogged as a result of excessive sweating. When the sweat can't get out, heat rash develops. Symptoms of Heat Rash The most common symptoms of heat rash are: Small, itchy red bumps on the skin and a prickly, stinging, or burning sensation. Who Gets Heat Rash? Heat rash can occur at any age but is most common in young children. Active people, newborns in incubators, and bedridden patients with fever have an increased risk of developing heat rash. Can Heat Rash be Treated? Heat rash usually goes away on its own within a few days. In severe forms, heat rash can interfere with the body's heat-regulating mechanism and cause fever, heat exhaustion, and death.
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