I have a lunar dove that since two days ago a tight swelling appeared and he is low appetite, cornering, trembles and seem that he has some breathing problems because sometimes returns its head so what is his disease and how can cure him and is it dangerous for me?
It is recommended to take him to an exotic veterinarian to take a blood sample and to make a diagnosis, as it could be a hypovitaminosis or a diseases such as herpesviruses, among other possible diagnoses.
As for the swelling, it could be a tumor. In any case, it should be analyzed. From the picture it doesn't seem to be a zoonosis but always wash and disinfect your hands after touching your bird.
All the best.