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I have a big blister under the sole of my foot (from the bottom of my toes to the entire upper part) and the blister has popped and it's raw.

It is important to cover the wound with a bandage until a scar tissue has formed and it is no longer raw. Additionally, applying an antibiotic ointment like Polysporin on the wound can help prevent infection and promote healing. After a few days, you can keep the wound uncovered again.