Renee Zellweger, Mariah Carey and Cameron Diaz were blessed with many genetic gifts — and they have glam squads, world-class dermatologists on speed dial and sky-high beauty budgets to boot. But despite that, they have openly shared they?ve struggled with their skin. How?s that possible, you ask" These three have rosacea.

So, what exactly is rosacea"

Rosacea is a chronic skin condition that appears mostly on the face, and sometimes on the neck, chest, scalp and ears. It causes a ruddy-looking, reddened complexion that usually itches and feels hot. Though it?s known to beset Caucasian people (it was once literally referred to as ?the Curse of the Celts?), experts recently discovered that any of us can be affected regardless of skin type and ethnicity.
At the most basic level, rosacea is caused by a slight abnormality in facial blood vessels. A reported 16 million Americans have rosacea, and you?re more likely to have it if you?re a woman, have fair skin, are over the age of 30, are a smoker or have a family history of rosacea.
Rosacea sufferers go through periods of remission and flare-ups, and symptoms become more severe with age. People with rosacea usually complain about their skin becoming irritated, red or flushed, often with swollen red bumps (which sometimes look similar to acne). Less frequently, toward the end of a rosacea flare-up, some people find themselves with a red, swollen nose (this condition is called rhinophyma).
Don?t want to sca...