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Heat Rash

Even though heat rash occurs frequently, it is not as common as people believe; oftentimes, we just assume that any rash that occurs when it's hot outside must be a heat rash. Understanding the difference between heat rash and other rashes like impetigo, eczema, folliculitis, and poison ivy is important so that you understand how to properly treat it.

Heat rash occurs when a person becomes overheated due to excess clothing or high temperature. As the body temperature rises, causing sweat to be released, the sweat ducts become blocked and burst.

Prickly heat

Prickly heat, also called miliaria rubra, is the most common form of heat rash. When this occurs, the sweat duct turns red and becomes swollen, possibly triggering a tingly or stinging feeling. You may also notice a hint of itchiness as well.

The inflamed sweat ducts appear as tiny bumps with a red ring around them. These typically congregate beneath the clothing and can be found within the folds of the skin, including the neck, armpits, and groin areas.

Miliaria crystalline

Similar to prickly heat, this kind of heat rash happens when the sweat ducts are obstructed and rupture. However, the affected sweat ducts are closer to the surface of the skin and do not swell. As a result, small blister-like formations will show up on the skin that lack any discoloration. These usually emerge on parts of the neck, head, or upper chest.

Prevention

Preventing heat rash revolves around staying cool. For example:

  • Dress in clothing that is fitting for current weather conditions. Also, be sure it is breathable and not too snug.
  • Stay away from extreme heat and humidity whenever feasible.
  • Try not to use heavy skin creams such as moisturizers or other oil-based products capable of blocking the sweat ducts.

Treatment

Heat rash will usually subside on its own after a few days, but sometimes it requires additional care. Methods of treatment include:

  • Removing layers of clothing or moving to a cooler environment (e.g., air conditioned room).
  • Mild topical steroids.
  • Calamine lotion.
  • Cool, damp cloths.
  • Antibiotics to combat related infections.