5 Signs and Symptoms of Heat Rash

May 7th 2016

Heat rashes affect babies and adults, and can lead to serious conditions if the body becomes overheated. Prevent the risks of heat rash by taking precautions in heat and humidity. Remove clothing that is obtrusive and heavy, limit your activities outdoors in extreme heat and seek cooler environments to cool your body down. Drink plenty of fluids to avoid dehydration, and apply cool compresses when a heat rash develops. Most people notice that heat rashes disappear once they move to cooler temperatures.

Clear Blisters

The mildest form of a heat rash typically produces clear, fluid-filled bumps and blisters on the skin. You may notice that the bumps and blisters break easily and ooze fluid. This type of heat rash commonly affects sweat ducts within the top layer of the skin. Heat rashes are most commonly found in the skin folds, such as the elbow creases, groin or armpits.

Itching and Prickling

Heat rashes are often known as prickly heat because a rash on the skin caused by blocked sweat ducts causes the skin to itch and feel prickly. This type of heat rash occurs deeper within the skin and produces pain and discomfort in addition to itching.

Clusters of Bumps

It is unlikely that a heat rash only produces one bump on your skin. Heat rashes produce clusters of bumps on the skin, targeting areas of the skin covered by clothing. You may notice a small group of red or flesh-colored bumps gathering in the skin folds of your body when developing a heat rash.

Pus-Filled Bumps

Some people develop heat rashes with inflamed and pus-filled bumps on the skin. The fluid oozes out of the sores on the skin and may cause itching and discomfort.


Heat rashes are caused by hot and humid temperatures combined with irritation of the skin that is covered by clothing. The sweat ducts become blocked, which can ultimately lead to an inability to sweat where the rash is present. You may soon become intolerant of the heat when the sweat ducts are blocked. As a result, you may feel fatigued and overly tired, as if you were dehydrated.


Heat rash, also known as prickly heat, is a condition that causes a pink or red rash to form on the body, particularly areas where clothing covers the skin. The condition occurs when your sweat ducks are blocked and begin to swell. The condition can cause pain, discomfort and itching. Heat rashes are more common among babies when dressed too warmly, but adults can also be affected in humid and hot climates. Learn about the signs and symptoms of heat rashes to distinguish skin changes from infections or other medical conditions.

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