Sarcoidosis is a systemic inflammatory disorder of unknown etiology, characterized by the formation of noncaseating granulomas, multisystem involvement, intrathoracic (pulmonary and lymph node ...

Lupus pernio: common in African American women, represents chronic sarcoidosis ... arthralgia in 25% to 40% of patients; deforming arthritis is rare; knees, elbows, wrists, and small joints ...