Country Singer Dustin Lynch -- Hit in the Face With Beer Can (VIDEO)

Country singer Dustin Lynch got a beer can chucked AT HIS FACE during a concert Friday night ... oh, and did we mention this went down at something called the Mullet Festival?

Lynch was playing the headlining gig at the Boggy Bayou Mullet Festival in Niceville ... when some not so nice person threw a can at his noggin and made contact.

Lynch tries to locate the thrower to no avail ... and shortly after the concert tweeted he had to go to the hospital to get stitches.