Rosacea is a skin condition that causes reddened skin and rash, usually on the nose and cheeks. There is no test for rosacea, so health care providers will typically diagnose it based on the appearance of the skin and your health history. They may run tests to rule out any other conditions. Learn more from NIAMS:
What is rosacea? It is a long-term disease that causes reddened skin and pimples, usually on the face. It can also make the skin thicker and cause eye problems.
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