Blisters are a common sports injury caused by a combination of friction and moisture. Blisters normally
Blister
cause pain that limits your activity and resolve and go away. You should take good care of blisters to avoid infection. Running in pain with an altered gait can cause you to injure another body part. A couple of days off if needed can prevent a longer down time.
And no, you will not get gangrene from a friction blister. However, if you are diabetic with insensitive feet caused by diabetic peripheral neuropathy you will not have a normal response to pain. In that set of circumstances there is a higher danger of infection which can spread deeply and widely and cause serious problems. If you are diabetic please check your feet regularly and get professional care at the first sign of any problem.
More information on blisters can be found on my running injuries website.
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