Uploaded with ImageShack.us I have had several birds in the past that get these swollen eyes. This Dutch Bantam Hen is about 5 or 6 years old. The mass will continue to grow if not removed. I made a slice with a single edged razor blade or other similar sharp instrument. Uploaded with ImageShack.us Remove the mass with forceps or tweezers. You can see the edges it is a solid yellow mass. There will be some bleeding. Uploaded with ImageShack.us I put some blood stop and small pieces of paper towel to from a bandage that will fall off on it's own. Put the hen by herself in a clean bedded cage. Do not put her back with the flock as they will pick at the wound and in all probability kill her. Uploaded with ImageShack.us A cross section of the removed mass. This is her right eye that was done 3 weeks ago. It healed up nicely but there is a little baggy skin under the eye. Uploaded with ImageShack.us OK now for my question. What causes this mass to form and how can I prevent it from happening?