1. Heat Rash Slideshow Pictures
2. Summer Skin Hazards Slideshow Pictures
3. Dehydration Tips Slideshow Pictures

Medical Author:

Benjamin Wedro, MD, FACEP, FAAEM

Benjamin Wedro, MD, FACEP, FAAEM

Dr. Ben Wedro practices emergency medicine at Gundersen Clinic, a regional trauma center in La Crosse, Wisconsin. His background includes undergraduate and medical studies at the University of Alberta, a Family Practice internship at Queen's University in Kingston, Ontario and residency training in Emergency Medicine at the University of Oklahoma Health Sciences Center.

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Medical Editor:

Charles Patrick Davis, MD, PhD

Charles Patrick Davis, MD, PhD

Dr. Charles "Pat" Davis, MD, PhD, is a board certified Emergency Medicine doctor who currently practices as a consultant and staff member for hospitals. He has a PhD in Microbiology (UT at Austin), and the MD (Univ. Texas Medical Branch, Galveston). He is a Clinical Professor (retired) in the Division of Emergency Medicine, UT Health Science Center at San Antonio, and has been the Chief of Emergency Medicine at UT Medical Branch and at UTHSCSA with over 250 publications.

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In this Article

• Heat rash facts
• What is heat rash?
• What are the causes of heat rash?
• What are the symptoms of heat rash in children and adults?
• What does heat rash look like?
• Heat rash pictures
• Who is at risk for heat rash?
• How is heat rash diagnosed?
• What is the treatment for heat rash?
• Home remedies for heat rash
• Medical treatment for heat rash
• How can heat rash be prevented?
• How effective are electric fans in preventing heat rash?
• How can people protect their health when temperatures are extremely high?
• How much water should I drink in hot weather?
• Should I take salt tablets during hot weather?
• What is the best clothing to wear in hot weather or a heat wave?
• What is the prognosis for heat rash?
• Pictures of Heat Rash - Slideshow
• Pictures of Summer Skin Hazards - Slideshow
• Pictures of Dehydration Tips - Slideshow
• Patient Comments: Heat Rash - Causes
• Patient Comments: Heat Rash - Treatment
• Patient Comments: Heat Rash - Symptoms
• Patient Comments: Heat Rash - Describe Your Experience
• Find a local Doctor in your town
• Heat Rash Index

It is uncertain why some people get heat rashes and others don't.

The sweat gland ducts can become blocked if excessive sweating occurs, and that sweat is not allowed to evaporate from a specific area. Some examples of how blockage may occur include the following:

• Creases in the skin like the neck, armpit, or groin have skin touching adjacent skin, which makes it difficult for air to circulate, and prevents sweat evaporation.
• Tight clothing that prevents sweat evaporation.
• Bundling up in heavy clothing or sheets. This may occur when a person tries to keep warm in wintertime or when chilled because of an illness with fever.
• Heavy creams or lotions can clog sweat ducts.

Babies have immature sweat glands that aren't able to remove the sweat they produce. They can develop heat rash if they are exposed to warm weather, are overdressed, excessively bundled, or have a fever.

Heat rash may occur as a side effect of some medications (for example, isotretinoin [Accutane] or clonidine [Catapres]).

The common symptoms of heat rash are red bumps on the skin, and an itchy or prickly feeling to the skin. These are due to inflammation of the superficial layers of the skin and the prickly sensation is similar to the feeling of mild sunburn.

The symptoms of heat rash are the same in infants and adults; however, since an infant can't complain about the rash sensation, he or she may be fussy.