Do you believe hot water is good to you feet after a long walk?

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I went out with my wife for a long walk a couple of days ago. She said that her feet hurted and there was a blister. I advised she wash her feet with hot water. But she refused. The next day her feets hurted more. I have the experience that If you put you feet in hot water, the blister will dispear soon. You can try to add cold water little by little into hot water until you just can bear, then you can use it to wash you feet. Do you believe hot water is good to you feet after a long walk?