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Adults usually develop heat rash in skin folds and where clothing causes friction. 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.

Heat rash develops when some of your sweat ducts clog. Instead of evaporating, perspiration gets trapped beneath the skin, causing inflammation and rash.It's not always clear why the sweat ducts become blocked, but certain factors seem to play a role, including: 1. Immature sweat ducts. A newborn's sweat ducts aren't fully developed. They can rupture more easily, trapping perspiration beneath the skin. Heat rash can develop in the first week of life, especially if the infant is being warmed i...

Factors that make you more prone to heat rash include: 1. Age. Newborns are most susceptible. 2. Tropical climates. People living in the tropics are far more likely to have heat rash than are people in temperate climates. 3. Physical activity. Anything that makes you sweat heavily, especially if you're not wearing clothing that allows the sweat to evaporate, can trigger heat rash.

Heat rash usually heals without problems, but it can lead to infection with bacteria, causing inflamed and itchy pustules.

To help protect yourself or your child from heat rash: 1. Avoid overdressing. In summer, wear soft, lightweight, cotton clothing. In winter, children should dress only as warmly as an adult. 2. Avoid tightfitting clothes that can irritate skin. 3. When it's hot, stay in the shade or in an air-conditioned building or use a fan to circulate the air. 4. Keep your sleeping area cool and well-ventilated.