Mold on the feet of our cigars can put the fear of God in us and when I have seen it in my stash I take my cutter and start working back to the head. When I don't see anything that hints of mold I quarantine that cigar(s) and give it a stern lecture about cigar hygiene and telling it to call me when there is a hint of that crap. I bet I've smoked cigars in the past couple of decades that had "some" mold on the foot and I'm still here and doing fine.