Abstract
Rosacea is classified into four clinical subtypes, namely erythematotelangiectatic, papulopustular, phymatous, and ocular. There is also a granulomatous variant, which is recognized in the rosacea spectrum. The objective of this study is to take a closer look at the different histopathologic patterns and cellular compositions seen in granulomatous rosacea and their correlation to the clinical presentation. Facial biopsies from patients previously identified with a clinical diagnosis consistent with rosacea, and who demonstrated a granulomatous infiltrate upon histopathologic examination, were reviewed and the results were correlated to the clinical presentation. Four distinct histopathologic granulomatous patterns were identified, namely nodular, perifollicular, diffuse, and a combined perifollicular and nodular patterns. The clinical presentation varied greatly among patients and failed to correlate to the microscopic findings. The varied clinical features seen in our study favors the theory that granulomatous rosacea is not a clinical subtype of rosacea per se, but a distinct histological variant, which can be found in most of its clinical spectrum.
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