Heat rash or prickly heat is a skin problem caused by blocked sweat ducts. It can be itchy and uncomfortable, but it is not serious and can be treated by keeping cool and dry. Prickly heat rash is a type of heat rash that happens when sweat becomes trapped under the skin. Learn about the symptoms, causes, treatments and prevention tips for this common skin condition. Heat rash is a harmless rash caused by sweating a lot. Learn how to recognise, treat and prevent it with advice from the NHS. Miliaria, also known as sweat/heat rash or prickly heat is a skin condition caused by blocked or inflamed sweat ducts. Heat rash is common especially in hot, humid or tropical climates.
