A trick I learned from I can 't remember where, but that I've used with success is a needle and thread. At night, spear through (in and out) of the the blister with a clean needle and thread. pull out the needle, but leave the thread sticking out both ends. I'd recommend covering it with a bandage while you sleep. This allows the blister to keep discharging over night and in the morning you can pull out the thread. A super fast recovery and no irritants the next day.