Effective Remedies for Prickly Heat Relief Prickly heat, also known as heat rash or miliaria, is a common skin condition that can make summer days quite uncomfortable. It occurs when sweat gets trapped under the skin, leading to small red bumps and an itchy or prickly sensation. If you're dealing with prickly heat, you're probably looking for quick and effective remedies to find relief. This article will explore various natural remedies and practical solutions to help you alleviate this ... Heat rash (prickly heat) is a skin irritation caused by sweat trapped under the surface. Learn how to prevent and treat it, and when to see a doctor. Heat rash is a harmless rash caused by sweating a lot. Learn how to recognise, treat and prevent it with advice from the NHS. Heat rash, also called prickly heat or miliaria, is caused by blocked sweat ducts. Here's how to prevent and treat it.