Help with a very large open blister

I have a very large open blister on the bottom of my foot caused by excessive running. Im running a half marathon on sunday so im desperate for it to heal asap ! Ive read alot of conflicting statements, some say to leave it uncovered and let the air get to it, and some say it should be covered. One nurse told me that a compeed patch creates a warm moist environment and this is good for healing ?? through the day im wearing a compeed patch which allows me to walk on it with less pain, and obviously creates a sterile area around the wound, but should i remove it when i get home and allow it to dry ??

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