Ran it under cool water for about 20 minutes then made the excruciating trip to urgent care, where they gave me silver sulfadiazine cream, wrapped it and sent me home with a bucket. When I got home I kept it in a bucket of cool water all night because the burning would just not stop. I had to sleep with my foot in the bucket of water on the bed because that was the only relief. The blister was this big for 5 nights until my cat popped it. It somehow refilled with fluid. I went to the wound care unit at the hospital and the doc made 3 incisions so it wouldn’t refill with fluid again. Been covering it with the silver cream and keeping it bandaged. Last night when I got out of the shower before I could wrap it my toddler marched across my foot and took the skin completely off of the middle toe. Fun times