I don't doubt that people have had good results after using it on their face, but I wouldn't risk it. Bloodroot and Zinc Chloride are powerful and unpredictable. Many people have been badly scarred from it because the cancers were deeper and larger than the cancer's surface area indicated. If I had a BCC on my back, I'd use it no problem, because I don't care about getting scarred there. But my face is more precious to me. At least a surgeon can immediately send you to a plastic surgeon if things get out of hand.
I highly receommend you buy and read the book "Cancer Salves" by Ingrid Naimen.