Justin shared the post with his 539.2 million followers.
He shared the clip explaining the diagnosis which is a complication of shingles that can lead to facial paralysis.
In the clip posted on Friday, Justin showed the devastating effects of his diagnosis.
But he added he was going to “rest and get better”.
He revealed that he feared struggling to eat after he revealed the diagnosis was Ramsay Hunt syndrome – a rare neurological disorder characterizsed by paralysis of the facial nerve (facial palsy) and a rash affecting the ear or mouth.
The reveal came days after the pop star was forced to cancel dates on his Justice World Tour and has asked fans to pray for him.
He showed how his eye wasn’t blinking, can’t smile, and his nostrils don’t move at all on the right side of his face.