NOD2 and sarcoidosis: Case 1 was a 30-year-old woman receiving 25 mg etanercept twice weekly who had been diagnosed as early-onset sarcoidosis by biopsy of skin rashes at 5 months old and genetically diagnosed with Blau syndrome with <i>CARD15</i>/<i>NOD2</i> mutation (N670K) at 13 years old.