• Irritation caused by Topical Skin Care Agents
• Topical Steroids
• Poorly Functioning Skin Immunity
• Free Radical Damage
• Stress
• Menopause
• Sun / UV Exposure
• Overactive Facial Nerves
• Various Foods and Drinks
• Exercise
• Facial Collagen Degradation
• Gastrointestinal Tract Disorders
• H. Pylori (Heliobacter Pylori)
• Environmental Factors

Also recommended for rosacea patient review: Rosacea: An Introduction — Help for Australians :

Triggers

A large range of rosacea triggers exist. This is a reasonably comprehensive list that I periodically update.