I googled "severe blister care" a few days ago. Up came Web MD and a couple of others. I learned a few things. I strongly suggest you do the same. Duct tape is about the worst thing you could put on a blister, it will pull the skin off the blister. If the skin over the blister is torn it becomes an open wound and must be treated as such to prevent infection. Antibiotic ointment is a must in your 1st aide kit. I have no experience with leukotape but have heard good things about it. New skin is an option. People have been knocked of the trail because of blisters, be smart, don't be one of them. Treat your blisters properly.