Burn Blister on foot popped...now what?

Ok, so I burned the bottom of my foot on charcoal about 2 weeks ago and had a blister about 3/4th of an inch in diameter. It recently popped on it's on...maybe today (only on one small section on the outside). Where it popped hurts alot...and the skin underneath is VERY sensitive. I've cleaned it with rubbing alcohol, and put antibiotic ointment on it...is there anything else I should do with this painful, deflated burn blister? Is it ok to just wait for the rest to fall off? Is it normal for the exposed part to be this sensitive?