IM not sure....but I didnt want to look at the post and not respond. Can you see a bug bite? Maybe a spider bite? Does it seem to be bothering her? I would just keep an eye on her( or him) for a few days...if it doesnt get better...maybe a trip to the vet?
Maybe squirt some water at that general area. Dont force water into the ear channel. Hopefully it works itself out. I also didn't want to view and not post.
There is a article in the july issue of Practical Poultry magazine on blocked/infected ears. Might want to check it out its in the poultry Q&A section.