A heat rash, otherwise known as prickly heat or miliaria, occurs when sweat gets trapped in the skin, causing inflammation.

Medically reviewed by Josephine Hessert, DOMedically reviewed by Josephine Hessert, DO Heat rash, medically known as miliaria ...

Miliaria crystallina is the mildest form of heat rash, and it is shown by “tiny, clear, fluid-filled bumps that break easily,” according to the Mayo Clinic.These occur when the sweat duct ...

A heat rash is characterized by stinging or prickling skin and is exacerbated by sweat. You'll usually notice a heat rash appearing on your neck, scalp, chest, legs, and elbow crease.

Although heat rash and eczema have some similarities in their appearance, they're not the same. See photos of heat rash and eczema and learn more about how to differentiate them.

Heat rash often appears as small, itchy, colorless or slightly reddish bumps. The affected areas might also feel prickly or irritated. What to do: Keeping the skin cool and dry is key.

Heat rash is a red, stinging rash that develops when you're hot and sweaty. "It's most likely to show up in areas where sweat gets trapped, like inside your elbows and behind your knees," the ...