Just got my first USB Erupter today and I didn't realize it would become so HOT!
I've got a second coming in two weeks and three K1 nano USB miners coming (hopefully) this month too.
I've bought a USB fan and hub coming next week. I've got a fan on my one Erupter to cool it, I'm guessing it's not okay NOT to cool it?
Yes it can get quite hot. But a little fan works wonders:
intron