Q&A: What causes heat rash?

As sweat evaporates off the skin, it cools our bodies under hot conditions. When this process goes awry, heat rash can develop.

Heat rash (prickly heat)

First aid - Heat rash

Does anybody know what these are? They hurt when touched and I didn't even realise I had them until earlier today. Is this serious? : r/bigboobproblems

Heat rash: Symptoms, treatment, appearance, and causes

Please suggest treatment for heat rashes on testicles.

Heat rash - Symptoms & causes - Mayo Clinic

More Than Skin Deep: Common Skin Issues You Need To Know

DFINE Eyes And Aesthetics Miliaria Is One Of The Most Common Skin Rash That People Of All Age Groups Experience During These Are A Few Precautions That Can Be Taken

What is your personal experience of heat hives? - Quora

What Is Heat Rash + How To Treat It and Prevent It, According To a Dermatologist