This is a helpful reference:
Lee GL, Zirwas MJ.
Granulomatous Rosacea and Periorificial Dermatitis: Controversies and Review of Management and Treatment. Dermatol Clin. 2015 Jul;33(3):447-55.
Abstract: Granulomatous rosacea and periorificial dermatitis are common skin conditions affecting the face. This article examines the historical origin, causes, clinical presentation, and management strategies for these entities.
Link to Full Text: Download Granulomatous Rosacea Review