Blister turned purple?? Help!?

So i have been doing a fair bit of long distance running on a dailt basis for the last week, about 4 days ago i got a blister on the botton of my foot, i popped it each day... so i could put my joggers on and not be in pain while i ran on it! Now its purple?? i havent popped it in a day now only because of the... show more So i have been doing a fair bit of long distance running on a dailt basis for the last week, about 4 days ago i got a blister on the botton of my foot, i popped it each day... so i could put my joggers on and not be in pain while i ran on it!
Now its purple??
i havent popped it in a day now only because of the color...
Could it be infected?
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