Heat rash — also known as prickly heat, summer rash, or wildfire rash — occurs when the sweat gland ducts become blocked with sweat. Cooling or gently patting the rash may provide some relief. The ...

Babies are more likely to get heat rash than adults because their sweat ducts are still developing. It can appear as bumps or blisters on the skin and usually resolves on its own. Heat rash, which ...