“There is no blood test that can accurately diagnose sarcoidosis. If you have a skin rash, sarcoidosis sometimes can be diagnosed by a biopsy – a skin specialist will remove a pinch of skin tissue and examine it under a microscope. Because infections can also cause granulomas that look similar to sarcoidosis, your doctor will test your lung or skin sample for infections such as tuberculosis to rule out other potential causes of your symptoms.  As for as treatment the goal is remission, if needed.”

American Lung Association