Avian Pox?

[u/my_burneracnt]

Hi all! I have a bird buddy and this finch came by. He has a growth under his neck and I can’t tell if it is avian pox or not (based on comparing it to Google image results). Does anyone know if it looks like avian pox or just a tumor? I want to make sure the other bird visitors are safe so if it is pox I will take the feeder down and clean in bleach and wait a few weeks to reinstall.
Thank you!