Pls help! Have "dirt" regularly under fingernails & black cracking skin on fingers as well (a little on my heel too). Not sure what to do--if it's yeast overgrowth, too much acidity, dehydration (fingers look great on 10-day Master Cleanse, Pancha Karma etc.). Any help would be much appreciated! I do a lot of private "cheffing" consultations so this looks terrible to clients!