Have fresh popped blister on the back of one of my heels myself, thanks to shoes getting wet while walking. Don't step in a puddle in dress shoes...

So I'm stuck with bandaids until the skin heals and toughens back up. Fortunately tomorrow I have a field trip and get to wear casual clothes. Will pull out my nice warm soft wooly socks.

In general, wear wool socks while hiking / hill walking. I swore by wool socks even when I worked in the Arizona desert in the summer. Do whatever it takes to keep your feet DRY.