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Heat rash
Heat rash — also known as prickly heat and miliaria — isn't just for babies. It affects adults, too, especially in hot, humid conditions. Heat rash occurs when sweat is trapped in the skin. Symptoms can range from small blisters to deep, inflamed lumps. Some forms of heat rash are very itchy. Heat rash usually goes away once the skin cools down. Severe forms of the condition might need treatment from a health care provider.
When to seek medical or mental health expertAlways seek the advice of your physician or other qualified health provider with any questions you may have regarding your health. Never disregard professional medical advice or delay in seeking it because of something you have read on the community.Adults usually develop heat rash in skin folds and where clothing rubs against the skin. In infants, the rash is mainly found on the neck, shoulders and chest. It can also show up in the armpits, elbow creases and groin. Types of heat rash The types of heat rash are classified according to how deep the sweat is trapped in the skin. Signs and symptoms for each type vary.
Heat rash develops when a duct that leads from a sweat gland to the surface of the skin is blocked or inflamed. This then blocks the opening of the sweat duct on the surface of the skin (sweat pore). Instead of evaporating, sweat is trapped beneath the skin, causing irritation and bumps on the skin.
Treatment for mild heat rash is cooling the skin and avoiding exposure to the heat that caused the condition. Once the skin is cool, mild heat rash tends to clear quickly.
To help protect yourself or your child from heat rash:
For informational purposes only and not a substitute for professional medical advice, diagnosis, or treatment.
© Mayo Clinic
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