There are a multitude of different problems that might affect the skin & nails of your feet.  These can be grouped into three categories:  fungal conditions, inflammatory conditions, viral conditions and skin growths (malignant & benign).

Toenail Fungus is an unappealing foot condition that causes the toenail to become dense, yellow and brittle. If this condition goes untreated for a lengthy amount of time, the brittleness of the toenail will advance and cause it to crumble further.