Justin Bieber said that he suffers from a rare facial disorder. Here's everything you need to know.

Justin Bieber revealed on Friday that he suffers from Ramsay Hunt syndrome, a rare ailment that has paralysed half of his face.

He announced that his forthcoming tour dates would be cancelled since he is "physically, obviously not capable of executing them."

The varicella zoster virus, which causes chickenpox in children and shingles in adults, produces Ramsay Hunt syndrome, a neurological disorder.

Even after you've recovered from chickenpox, the virus might stay in your body for the rest of your life, irritating and inflaming the nerves in your face.

Each year, only about five to ten persons out of 100,000 may get Ramsay Hunt syndrome.

Herpes zoster oticus is the actual term for the sickness; the more familiar moniker derives from neurologist James Ramsay Hunt, who was the first to describe it.