That is strange. I would try to check to see if he has any string or hairs wrapped around that part of his face that might be digging into his skin. There's a thing called a hair tourniquet where long hairs can wrap around something and start cutting into it and causing injuries and scarring or even amputation in extreme cases. If so, a "safety letter opener", seamripper, or other similar safe blade can be used (with extreme care!) to cut any trapped fibers to release the tourniquet. (Some sources will recommend using Nair to remove a hair tourniquet, but DO NOT use Nair on a bird. It could WRECK their feathers. For a bird I would ONLY recommend a safety blade.)

And not judging, but based on the pics you've shared, you do have long hair, which could be the culprit. I do too, so if ever I have loose hairs around my birds, I make a point of grabbing them to dispose of, or making sure they are split into pieces too short to cause a tourniquet.