blisters on top of blisters... under thick callus???

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ok so I religiously wear my vibram five fingers when I run/walk and workout... lately I've been going for longer runs/walks and I've developed two huge blisters under the callus on my heal.the callus is a great thing but I can't really deal with the blisters that have formed under it.

should I try to lance the blisters, or let them go away on their own?

its like a blister on top of another blister...

help??

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