I'm with everyone else. It's most likely the socks.
My buddy was questioning why I wear snowboard specific socks when I ride. I was almost speechless, replying "what do you mean? what kind of socks do you wear?" Friend: "2 pairs of long thick cotton socks" Me: "Let's stop at Sports Chalet on the way home, your birthday present is coming real early this year".
But an extra pair or 2 to have around, or next time wear dirty socks. I'd rather wear dirty socks than get infected blisters. At this point Saline washes & Neosporin are probably your best friends...