Please help. Mouth lesions for about a year. Now spreading to others.

[Shezadandy]

All seem like healthy chicks (aside from cocci that I'm treating with corid) and the rare sneeze when eating from the Polish and one silkie chick.
I guess if the Polish and Silkie don't stop sneezing, I will cull them as well. Ugh. So hard.

If they're sneezing while eating, it could be dusty feed. You can try wetting their feed to see if it solves the sneezing issue- they love moistened food, but of course only wet what they will eat that day.