It's been 3 days since Kevin Pillar was drilled in the nose by a 94-MPH fastball ... and yeah, his face still looks hell.
The MLB star showed off another selfie of the battle wounds he suffered after Jacob Webb accidentally pounded his mug with a heater during the Mets-Braves game on Monday night ... and it's still VERY bad.
You can see in the pic, Pillar's got two awful black eyes ... and the scrape on his nose is still bloody.
His whole face, meanwhile, is puffed up like a marshmallow -- but somehow, the dude still appears to be in great spirits.