Rosacea (rose-AY-sha) is a chronic skin disease that causes varying degrees of redness and swelling, primarily on the face, but also at times on the scalp, neck, ears, chest, and back. It is considered a vascular disorder (a disorder of the blood vessels). The condition can develop over a long period of time and is more common in adults, particularly those with fair skin. More women get it than men, though in men the condition is often more pronounced. Severe, untreated rosacea can lead to a disfigurement of the nose called rhinophyma. 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. It is believed that fluctuations in temperature (especially extreme heat or cold) is a common trigger. Spicy foods and alcohol consumption can also cause flare-ups.