Thanks for the update.Just left the vet. He thinks it could be Mareks, but also could just have a little virus type deal. He tested the spot and it was a tumor, I forget exact type but it isn’t cancerous. Just keep an eye on it spreading or growing any more.
Basically, just give him TLC and keep an eye on everything. If it gets worse or another bird gets sick it’s Mareks.
I'm glad you were able to get an answer hopefully things work out well.