Rosacea is a chronic skin condition involving inflammation of the cheeks, nose, chin, forehead, or eyelids. It may appear as redness, prominent spider-like blood vessels, swelling, or skin eruptions similar to acne.
Although the cause of rosacea is unknown, you are more likely to develop this harmless skin condition if:
Rosacea involves enlargement of the blood vessels just under the skin and may be associated with other skin disorders (acne vulgaris, seborrhea) or eye disorders (blepharitis, keratitis).
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van Zuuren EJ. Systematic review of rosacea treatments. J Am Acad Dermatol. Jan. 1, 2007: 56(1): 107-15