I am a little overweight (which I am doing something about) and my problem is that I get these huge deep blisters on the balls of my feet (about 3-5 cm in diameter - feel like I have a big flat stone under my feet, not like the little shallow ones that new shoes give you), doesn't matter which shoes I wear, high or flat, padded or not.... they are extremely painful and they get to the stage that I can't walk without a lot of discomfort. My mum, who is a lot bigger than me, does not have this problem, so I don't know how much it is connected to weight, or if it is something else. My dad seems to think it is a kind of tinea, but I don't know. I am on my feet every day, but never a marathon, and I don't wear shoes all weekend, so that it's bearable again by Monday. Then they peel and flake, then I get a callous, then another blister. Any ideas would be greatly appreciated...Please!!!