A very uncommon blister 

If you look closely at The second toe on this woman's foot, you'll see a subungul blister. To fix it, I stuck a sterile needle under the toenail, drained the fluid, and the nail deflated like an air mattress. Subungul blisters on the 3 Day are uncommon but this case was even stranger - the blister extended all the way around to the top of the nail.