(Over the whole body there are around 200, all of which is completely harmless. They particularly love our feet, which provide a warm, dark and humid environment, especially under the toenails, between the toes, and around the heel.
Now don't go freaking out and scrubbing at your feet mercilessly, most of the time funghi does not cause a problem unless it multiplies in particular areas.)
http://www.nhs.uk/Conditions/Athletes-foot/Pages/Introduction.aspx