NOD2 and sarcoidosis: Case 2 was a 21-year-old man receiving adalimumab every 2 weeks who had been diagnosed as early-onset sarcoidosis by biopsy of skin rashes at 1.5 years old and genetically diagnosed as Blau syndrome with <i>CARD15</i>/<i>NOD2</i> mutation (C495Y) at 5 years old.