How do you prevent a blister that feels like its forming?

I was doing treadmill today and my shoe was rubbing the back of my heel. Now its all red with a throbbing, burning pain. A lovely blister is on its way. Is there a way to stop it before it reaches the bubble (and BIG ouch) stage? And if its too late before I get any responses, how do I get rid of the stupid thing? I'm scared to pop it so I hope there's another easier way. Sure, I've had blisters before but I would just let it go away on its own. This blister, I have to get rid of because I'll not have it mess up my new exercise routine that I started on Mon., 2 days ago. I'm really annoyed about this blister!!! Oh, one more thing ---- Can anyone advise me of some good walking sneakers?

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