If it's an eye ulcer from a peck, debris, etc., you'll usually be able to see it by a shining a light in the eye. If it was a few pecks and one landed in the eye and some on the face, that might explain the swelling. Like Wyorp said, Terramycin and flushing the eye will help but keep a close watch for any other symptoms in case it's something more. I had one recently with an eye ulcer and one day of saline drops and neosporin (I couldn't find my Terramycin) cleared it up.