Andrew, I started getting blisters on my arms a couple of YEARS ago and no one could figure it out. I went to my doctor, who refered my to a dermatologist (sp?), who tested me for so many things including skin cancer. Thankfully it wasn't that, but still no answer. On a routine visit back to my doc, I gave him one of my pens. After his very animated thank-you and showing it off to peole in his office, all of a sudden he became deathly silent and slowly turned to me. He put the 2 + 2 together and figured it out that I was alergic to many of the woods I was turning. The chips/dust, etc., combined with sweat, just ate away at my skin. I now where either long sleeves or these surgical sleeves he gave me.
I turned snakewood often, as I got a great deal on the stuff. Probably one of the culprits.