Causes and Symptoms
Do you live in a tropical climate? Is your weather hot and humid during the summertime? If so, then you’re probably already quite familiar with heat rash. Up to 1/3 of adults residing in a tropical region experience this condition that affects your sweat glands. Heat rash occurs when eccrine sweat glands – the ones found all over your body with a direct connection to the surface of your skin – become plugged. Instead of sweat evaporating into the air, it stays beneath the skin, resulting in inflammation and a rash.

Typical causes of heat rash include [1]:

Underdeveloped sweat ducts – seen in newborn patients
Physical activity and hard work
Medications – like some high blood pressure and acne drugs
Clothing materials – such as nylon and polyester
Heavy or electric blankets during the wintertime
Long stays in a hospital bed

Heat rash symptoms usually appear in adults within the folds of their skin and in the places where clothing causes friction. Infants encounter the rash on their head, neck, shoulders, chest, back, and in some cases – their armpits and groin. Depending on the type of heat rash you have (Miliaria crystalline, Miliaria rubra, or Miliaria profunda), you will develop clear blisters or bumps, red bumps, intense itching, prickly sensations, and/or goose bump-like responses.

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