Blueface's features may have taken on a purple glow after he let Ryan Garcia punch him ... because he was having some trouble breathing in a wild new vid.
The boxer livestreamed his hang with the rapper Friday night ... and, just 15 minutes into the stream, the duo engaged in an age-old guy tradition -- one dude punching another as hard as possible.
Launch Gallery Launch Gallery GettyBlueface asked if Garcia wanted to throw a haymaker at him .