Your poor kid. I've had that done...it is uncomfortable! Great that you are into alternatives. Oh, and you should see the scar I have! I had a pedicurist once insist on trying to remove the scar thinking it was a big callous. I'm like "touch it and I can't guarnatee that I won't kick you off that stool." Geez.
I've had great success with Indian Herb, but never used straight bloodroot. I've also not tried it on plantar warts. Aren't they viral? Maybe you should be using it internally? I was always curious about this b/c I had a few, but never looked deeply into it b/c it was some time ago and I've not gotten them anymore (makes me wonder if the virus went deeper into my system???).