Heat Rash (Miliaria)
Heat rash or miliaria appears when there is an obstruction in the flow of sweat typically due to humid, hot weather in summers. Prickly heat rash is one form of miliaria that develops due to overdressing or friction between the body parts. Prickly heat at first appears as clusters of red, small bumps that cause stinging or pricking sensation. Miliaria crystalline is another form of heat rash that causes clear and fluid-filled bumps with no other symptoms.