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Heat rash

Prickly heat, also known as miliaria, is an itchy rash of small, raised red spots that causes a stinging or prickling sensation on the skin.
Symptoms of prickly heat
The main symptom of prickly heat is an itchy rash that is made up of small, raised red spots. The rash usually appears a few days after exposure to hot temperatures.
Causes of prickly heat
Prickly heat occurs when the body's sweat glands become blocked. Excessive sweating can cause sweat to become trapped beneath your skin.
Treating prickly heat
Prickly heat is not a serious condition and rarely requires any specific treatment. The rash usually disappears after a few days.