Miker - I had the same sort of problem recently. I ran a full marathon on My 1st barefoot without any problems, but the next week, I noticed the skin right where your blister is was being scraped off of both of my feet. The abrasions got worse with every run for the next couple of weeks. Finally, I focused on quickly lifting my feet after every step which seems to have worked because the damaged area has finally healed. If I try to change my form, i.e. how my feet naturally land, I end up with other aches and pains, so for me, lifting before by body rotates and grinds off skin works for me.