The first thing to suspect is your shoes. Blisters come from your shoe rubbing on your toe. You may need a shoe with a larger toe box. You should have about half an inch between the end of your longest toe and the inside of the toe box. Maybe you're lacing your shoes too tightly. Maybe you need heavier socks. Maybe your shoes are too narrow. Before you ran the 10K you should have done several 6-7 mile long runs. Did you have any blisters during those training runs? If your shoes are new, did you test them on shorter runs before you ran the 10K?
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