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How do I help a blister heal faster?

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I didn't wear my shoes at the beach and walked around on the hot sand and concrete...not such a good idea because i got a big blister on each foot on the ball of my foot. It's really painful, and I have a big hiking trip in 2 1/2 days...I need to help this heal as fast as possible so I can go on my trip. They are so painful at times that it's hard to walk. but i can definitely tell it's not as bad as yesterday when i got it.:/
thanks!:)