Day 3: Nothing left of it above the skin but a rough circle of skin.
I found an easy way to fix the pad too. Lay the bandaid open, pad side up. Fold the paper sticky protectors back to expose the pad. Put a couple drops of cider vinegar on the pad, and lay an aspirin on top. Add a few more drops of vinegar on top of the aspirin, then crush the aspirin with a spoon, right on bandaid. The vinegar softens the aspirin and keeps the slippery rascal from shooting across the counter like a missile when applying the spoon.
I also tried using 2 spoons nested together to crush the aspirin and adding vinegar to make a paste.then pour 1/2 the paste on the pad & 1/2 on the wort. Then snugly tape down. This was messier but seemed to work well.
Edit: in total it needed 7 days of applications to completely clear the under-the-skin too.
May 28, 2019 edit: absolutely no trace or any return