This same problem has always stopped me from joining a charity KAL.
I am very allergic to anything wool or animal fiber related. I can stand near wool, but I cannot touch it at all. I can touch (meaning knit with) bamboo, silk, acrylic or cotton with no problems.
Sigh. I miss out on so much having this nasty allergy.
However, at least I CAN knit; there are yarns out there I CAN use which is something to be grateful for!
This setback just means I will never become a "yarn snob" because I won't ever have the pure "porn" pleasure of going to the LYS and touching the mmmmmm. Sigh.