I don't know what causes the bubbles, did you see this article, you may find some tips for his care in that.
http://www.aviculture-europe.nl/nummers/09e03a06.pdf
Are they bugs or is it debris that is getting into the nooks and crannies of his earlobes and wattles?
I think I may see some under his eye as well.
What do they look like when you pick them of?
If it is a bug, then you can treat with a permethrin based poultry spray or dust. If it's like a...