I have vague memories of my feet peeling like this as my calluses were forming last year while I trained. It doesn't hurt, it just looks kind of gross (but really, how often are people looking at the bottom of your feet? Probably a lot more often now that I've put this picture here. But you get my point!). Perhaps I should invest in a pumice stone. This was post walk, post lunch, post shower. I have lots of pictures from the walk as well, but you can find those over on the training blog that I'll be updating shortly.