What causes erythematotelangiectatic rosacea?

Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
Experts are not entirely sure what causes erythematotelangiectatic rosacea. They do know that it tends to run in families and in people whose skin flushes easily. The general consensus is that it is caused by some combination of heredity and environment. One theory is that it affects people whose blood vessels are prone to easy dilation (opening wider than normal).

More recently, researchers have pinpointed a protein that naturally occurs in the skin called cathelicidin as a possible culprit. They discovered that people who have rosacea have higher levels of this protein in their skin, and they also found higher levels of another chemical that helps activate cathelicidin.

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