The nosology of rosacea.

The National Rosacea Society (NRS) convened a committee of dermatology thought leaders to develop a standard classification system for rosacea. Based on the primary and secondary characteristics of this disorder, the NRS Expert Committee identified 4 types of rosacea: erythematotelangiectatic, papulopustular, phymatous, and ocular; one variant, granulomatous, also was recognized. The NRS Expert Committee also developed a grading system for rosacea signs and symptoms that will complement this classification system. The classification system and forthcoming grading system will help practitioners refine their diagnosis and treatment of rosacea to ensure better outcomes for patients.