Rosacea is a relatively common chronic disorder characterized by redness of the facial skin. It often involves flare-ups and remissions, so we'll discuss the basics of rosacea and the common triggers that can lead to those flare-ups.
The etiology, or cause, of rosacea is unknown. Various factors have been suspected to contribute to rosacea, but none has been confirmed. Abnormal blood vessels and nerve control seem to play an important role. Although rosacea has been linked to the presence of the Demodex folliculorum mite, there is no definite evidence that rosacea is caused by any bacteria, virus, or parasite.