The condition that we call prickly heat happens to adults and children when sweat becomes trapped under the skin.
It’s also called heat rash, sweat rash, or miliaria rubra. Children tend to get it more than adults because their sweat glands are still developing.
Prickly heat is uncomfortable and itchy. In most cases, developing the rash isn’t reason enough to see a doctor. There are treatment options and prevention tips for people who frequently get prickly heat.