Hi all, I'm running barefoot/minimalist for about half a year now, and basically I'm doing well. Since I'm mostly running on sharp, coarse gravel, I'm running about 90% of my weekly ~50-60km with Luna sandals, 5% with Vibram FiveFingers, and the rest barefoot. When I started, I couldn't run barefeet for more than 1km no matter what surface, but in the meantime my soles toughened up quite a bit, and now I can run fine up to 5km on asphalt or not too coarse gravel. Right now, I'm preparing for my first marathon (which I won't run barefoot, at least not yet). Thereby, I run at least every second day, and on every weekend I do at least one run above 25km. When I do those long runs, I frequently suffer from painful blisters that develop between the balls of the foot and the toes, right at the corner where the hard and thick ball skin and the soft and thin toe skin meet. Have a look at the attached picture where I've drawn a border around the area. I'm not exactly sure if those are "real" blisters. From this sunday's run I had a blood-filled blister between ball and big toe (which I sterilized and punctured), but the surrounding area also aches when being pressed without any clear visual sign. I think I much more likely to get those blisters on hilly runs. At least I've run several half-marathons that were flat, and then I had no such issues. Oh, and I'm also much more likely to get them on my right foot. Did someone else suffer from such a problem? If so, is there any cure to it?