This is not very stylish but... Last year I developed a painful callus in the ball of my foot. I had mainly been wearing a pair of supega shoes, so I think it was the rather hard sole of those shoes that was the cause. Anyway I stopped wearing them and eventually the callus went away. This year against my better judgment I started wearing a pair of supegas again (a family member gave me a pair) and sure enough, the same thing started happening again. I am now going to wear some proper trainers for a while, but then want to go back to sandals, etc. But I am a bit paranoid about this problem. Has anyone had similar from specific shoes or type of shoe??