What is prickly heat?

To start with, it is important to understand what prickly heat is and why it affects some people but not others. Also known as miliaria, it causes bumps or blisters to appear in a rash across areas of skin during a spate of hot weather. The rash can take several days to disappear, even if conditions are much cooler.

Prickly heat can appear almost anywhere on the body, especially confined areas such as the armpits, but tends not to affect the face. It often affects...
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