Justin Bieber: What is Ramsay Hunt syndrome, the condition affecting the singer?

“As you can see, this eye is not blinking,” Bieber told his fans in a video on Instagram. “I can’t smile on this side of my face. This nostril will not move.” The 28-year-old Canadian popstar has a condition called Ramsay Hunt syndrome. It is caused by the varicella-zoster virus – the virus that causes chickenpox.