rosacea /rōzā″shē·ə/ [L, rosaceus, rosy] , a chronic inflammatory disease seen in adults of all ages. It has two components: erythema and/or acneiform papules and pustules. It is associated with erythema, pustules, and telangiectasia, especially of the nose, forehead, and cheeks and ocular symptoms of conjunctivitis. See also rhinophyma.