What you need to know about Ramsey Hunt Syndrome after Justin Bieber was diagnosed

"It's pretty serious, as you can see," Justin Bieber told fans as he revealed his diagnosis of Ramsey Hunt Syndrome and the resulting partial facial paralysis... paralysis.

After rescheduling three concerts on his world tour earlier this week due to ongoing health concerns, the 28-time Grammy winner revealed his diagnosis in an Instagram video demonstrating the neurological disorder's physical effects.

"Hello, everyone. Justin is here. I wanted to tell you what happened," Bieber said. "As you can probably see from my face, I have a syndrome called Ramsey Hunt Syndrome, and it was from this virus that it attacked the nerves in my ears and facial …