Well, a few things come to mind....some type of hyperostosis, basically out of control bone growth....mostly I am thinking of his foot....another thing,
cherry angiomas, well, they do occur as we age...(there is that word again), however, if he has had them for a long time, and given his sister has them, has he been tested for Fabrys?

http://www.mayoclinic.com/health/dif...stosis/DS00740

http://www.fabrycommunity.com/patien...abry-signs.asp

Just a thought, you can check these sites out and see if anything rings a bell.

So, will they continue the IVIG?