I was thinking it may have been helpful to hear from someone with first hand experience, instead of just some cruddy article out there, and that fowl pox in the subject line would help find those people. Are you thinking it is just better to not put another thread out there? I know some of them...
If no one writes back for a couple hours, just start a thread that has fowl pox in the subject line. Hopefully folks with experience will see that. You can also do a search (top right of this site) for the term fowl pox and you should see some threads with advice.
Hope he has a quick recovery.
What I read online is that you can try to boost the immune system with vitamin supplements, but some of the folks on here that have seen it a bunch will probably have better ideas.
Did he just start getting them? Or has he had them for a bit?