Fungus infection may create yellow patches on both your toenails and fingernails. It may become severe that the whole nail falls off from the nail bed. Once the infection catches your nails, the nails become crumble and soft. It will also create pain in your nail joints or nail beds if you are not treating it with good fungal nail cure. It is not easy to walk with infected nails. Apple cider vinegar solution can cure this contagious infection. Just wash the affected nails with anti-septic soap and dry it with a clean towel. Then apply few drops of apple cider vinegar over the openings and cracks of the infected fingernails to get effective cure.