Haha... Wow I have been wondering this. My arms get pretty itchy after I've been working in my tank. Well, I really only use my right arm. But it will feel itchy on the underside of the arm where my skin is a little more soft than the outside of my arm. I felt like I was crazy but I have been wondering for a while if anyone else felt this!
I use bloodworms every once in a while, but not often - so I don't think thats my cause.
I'm just sure to wash my arm really well with antibacterial soap when I finish.