Rosacea is a chronic condition characterized by facial erythema. Pimples are sometimes included as part of the definition. The pattern of redness on a person's face makes it easy for a doctor to diagnose rosacea. And most of the time medical tests are not needed or used.

Rosacea often flares when something causes the blood vessels in the face to expand, which causes redness. Things that cause a flare-up are called triggers. Common triggers are exercise, sun and wind exposure, hot weather, stress, spicy foods, alcohol, and hot baths. Swings in temperature from hot to cold or cold to hot can also cause a flare-up of rosacea.

People with rosacea may have:

- A flushed, red face with sensitive, dry skin that may burn or sting.

- Small bumps and pimples or acne-like breakouts.

- Skin that gets coarser and thicker, with a bumpy texture.

- Dry, red, irritated eyes.