Heat rashes usually go away on their own within a few days. If the heat rash does not go away within 3 to 4 days, see a doctor.
What Are Symptoms of Heat Rashes?
Symptoms of heat rashes include:
- Small, raised spots on the skin
- May look like a cluster of tiny bubbles under the skin or like a cluster of small pimples
- An itchy, prickly feeling
- Mild swelling
- Skin irritation
- Skin redness (less obvious on brown or black skin)
- Rash often appears on the head, neck, chest, or anywhere where the skin rubs together (such as an armpit)
- Pale, cool, moist skin
- Profuse sweating
- Core temperature elevated to usually more than 100° F (37.7° C) but not above 104° F (40° C) (heat exhaustion)
- Body temperature of 104°F (40°C) or higher (heat stroke)
- Dizziness or lightheadedness
- Brain symptoms
- Fast breathing (hyperventilation)
- Fast heartbeat
- Skin redness (flushing) and warmth or heat
- Dry skin
- Vomiting or diarrhea
- Muscle cramps or weakness
- Absence of sweating due to dehydration
- Changes in blood pressure (may be high or low)
What Causes Heat Rashes?
Causes of heat rashes include:
- Clogged sweat ducts that cause perspiration to become trapped under the skin
- Underdeveloped sweat ducts
- Hot, humid weather or tropical climates
- Intense physical activity that causes excessive sweating
Babies and young children are more prone to heat rash because they are unable to regulate body temperature as well as adults.
How Are Heat Rashes Diagnosed?
What Is the Treatment for Heat Rashes?
Initial treatment for heat rashes and mild heat-related illness usually includes:
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