If you buy something through a link on this page, we may earn a small commission. How this works. Heat rash, also known as miliaria rubra, prickly heat, summer rash, or wildfire rash is common and can be uncomfortable. It happens when a blockage of the sweat glands causes perspiration to be caught in the deeper layers of the skin.
Prickly heat: What you need to know
Heat Rash: Pictures, Remedies, and More
Heat rash miliaria occurs when the flow of sweat is obstructed, usually due to hot, humid weather or overdressing. Prickly heat miliaria rubra A is a type of heat rash that appears as clusters of small, red bumps that produce a pricking or stinging sensation. Miliaria crystalline B appears as clear, fluid-filled bumps that generally produce no other signs or symptoms. Heat rash isn't serious and usually resolves when the affected area cools. Cool compresses or a cool bath might help. You can prevent heat rash by wearing loose, lightweight clothing and avoiding excessive heat and humidity. Mayo Clinic does not endorse companies or products.
Types of Heat Rash
If you buy something through a link on this page, we may earn a small commission. How this works. Miliaria rubra, commonly called prickly heat or heat rash, is a rash that causes the skin to turn red, along with a warm, stinging, or prickly sensation.
Heat rash miliaria rubra , also known as prickly heat, is a rash of small red bumps caused by blockage of the sweat glands. It can be due to high fever, excessive sweating, or being over-bundled. It is commonly seen in hot, humid tropical climates.