Stephen J. Schueler, M.D.

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Heat Rash Overview

What is heat rash?
A person with a heat rash has an itchy, red rash that occurs during exposure to a hot environment. Heat rash is caused by dead skin cells that plug the sweat glands. Sweat builds up in the gland, underneath the skin. This causes swelling of the sweat glands, which results in a rash.

What are the symptoms of heat rash?
Symptoms often include warm dry skin with a red rash. The rash looks like tiny red bumps that cover the parts of the skin that are covered by clothing. The skin can feel prickly and itching is common.

How does the doctor treat heat rash?
Treatment of a heat rash includes avoiding the warm environment, avoiding skin lotions, avoiding sun exposure, an air conditioned environment, light clothing, and tepid water baths. The rash usually resolves on its own over several days.

Continue to Heat Rash Symptoms

Last Updated: Feb 8, 2010 References
Authors: Stephen J. Schueler, MD; John H. Beckett, MD; D. Scott Gettings, MD
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PubMed Heat Rash References
  1. Nanda S, Reddy BS, Ramji S, Pandhi D. Analytical study of pustular eruptions in neonates. Pediatr Dermatol. 2002 May-Jun;19(3):210-5. [12047639]
  2. Shuster S. Duct disruption, a new explanation of miliaria. Acta Derm Venereol. 1997 Jan;77(1):1-3. [9059666]
  3. Treadwell PA. Dermatoses in newborns. Am Fam Physician. 1997 Aug;56(2):443-50. [9262525]
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