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I am relatively new to running, and as I have upped my milage in preparation for the great south run, I've found that I keep getting long blisters along my instep al the way from toe to the middle on my arch. And only ever on my right foot. I have changed socks, and trainers (twice) and think that it is down to the edge of the insole rubbing on my foot, or down to my footstrike.
Does anyone have any idea on how I could avoid/reduce this in future, or any other theories on what causes this?