In 1950, Roger M. Cole and Byron J. Olson in collaboration with Veterans Administration physicians conducted epidemiologic studies of army veterans, reaffirmed the preponderance of sacrodosis in blacks in the U.S. and implicated a rural southern birthplace of both black and white patients as a predominant association with this disease.

Sarcoidosis is a condition that develops when groups of cells in your immune system form red and swollen (inflamed) lumps, called granulomas, in various organs in the body. The inflammation that leads to these granulomas can be caused either by infections or by certain things you come into contact with in your environment.