I had my bi weekly pedicure and once the Polish was removed I noticed a dark spot under my nail the now isn t this color cup discolored just the dark spot I pressed against the nail where the spot is its sword but the nail is still hard what could this be and waiting for calls I had my bi-weekly perdicure, and once the polish was removed, I noticed a dark spot under my toenail. The nail isn t discolored, just the dark spot. I pressed against the nail where the spot is. It s sore, and the nail still has hardness. What could this be, and what is the cause?