There are four grades of rosacea:
- Grade 1: Mostly redness.
- Grade 2: Pimples and other blemishes.
- Grade 3: Edemas (swelling due to fluid retention) and inflammatory bumps on the nose.
- Grade 4: Symptoms affecting the eyes.
No one knows the cause of rosacea, but it is thought to run in families and can be aggravated by environmental factors and diet. Although rosacea can be accompanied by pustules, it is not acne. Researchers believe rosacea might be caused by several things: abnormal function of the blood vessels, sun damage, and an abnormal inflammatory reaction. People with rosacea often learn that certain things trigger their flare-ups.