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usually uncountable, plural rosaceas
(pathology) A chronic condition characterized by redness of the face. quotations
It’s hardly surprising that rosacea tends to strike the fair-skinned, especially people of Celtic or Northern European extraction, according to the National Rosacea Society, an association that receives financing from pharmaceutical and cosmetic companies that market rosacea remedies.
2008 April 24, Camille Sweeney, “In a Perfect World, Rosacea Remains a Problem”, in New York Times