I have little blisters all over my torso, they have spread down my legs and arms but not as bad as my tummy and back.  They don't itch or hurt. Thank goodness they aren't on my face!   I went to my Immuno doc today and he took a picture of them, told me to stop taking the Midrin for the headaches.   (since the ins. company switched me from Privigen to Gammagard I've had migranes and headaches) and I have to go to a  dermatologist for a biopsy.  He told me that he won't give me any more treatments until they go away.  He told me he never saw anything like this and  said that some people just have it harder than others... I asked him if this was a side effect of the gammagard and he shrugged and told me that it could be.  I don't see where Midrin has a side effect of this rash.  Last month I increased my Vytorin, there is a side effect of rashes from that but I can't find any more data on it......   I don't want to give up my treatments,   I was SO sick before I started this....   Anyone else have this? Any thoughts?