Post Malone added another shocking face tattoo to his already extensive collection ... Post Malone, né Austin Richard Post, 22, added the new ink to his extensive collection Wednesday night ...

"He really does care about his fans," Rita Regan, who got Post ... own extensive tattoo collection, and most recently got the letters "DDP" inked onto the left side of his face.

Stepping out for a good time isn't easy for a celebrity when trying to keep a low profile, but Post Malone tried ... he does have a tattoo of her initials, DDP, on his face. This Is Every Hip ...

Johnny Cash influenced me a lot. He's a great storyteller." (For the record, Post Malone has a huge tattoo of Cash on his shoulder!) Fans who go down the YouTube rabbit hole will undoubtedly find ...