Penny, that looks sore!!
I had a young Mountain dog bump my face last month out of play, so I thought. I bent over again to pet on him, and that time, he had his mount/teeth open and bumped me in the exact same place..mouth, nose, and chin area..he has a big mouth! Of course. I got scratched on the upper lip and lower chin. Not bad, but a bit sore.
The gal that had him..on leash, has a real problem handling him. She's been working with him, trying to anyway. There is a park down the street from us that has a dog training class going on..on Saturdays. I see her there with him, dragging her along. Not sure she is ever going to get him under control!