I can't imagine the IVIG had anything to do with this...7 years later! The antibodies in IVIG only live for about 21 days, so impossible for them to have an impact that far down the road.

I may not have read your post correctly, but it seems the Psoriasis came BEFORE the IVIG treatment...so I don't know how it would have 'triggered' it, after the fact.

Psoriatic arthritis is an autoimmune process. Therefore, any illness, infection, trauma, injury, or something/anything that causes an immune response can 'trigger' a flare of psoriatic arthritis and psoriasis.