Rosacea is a chronic cutaneous disease of the convexities of the central face (cheeks, chin, nose and central forehead) w/ periorbital and perioral skin sparing. This condition is attributed to chronic vasodilation.
Remissions and exacerbations are common.
It typically appears after 30 years of age but may occur at any age.  It commonly affects fair-skinned individuals.
The common presenting symptoms are facial flushing, stinging/burning erythema, telangiectasia, edema, papules, pustules, ocular lesions, and hypertrophy of the sebaceous glands of the nose with fibrosis.
A history of episodic flushing often heralds onset of rosacea.