It's most likely not fungus if it's white. i had a similiar issue with a fingernail and went to a local clinic, they told me it was fungus, freaked me out by saying they were going to put me on medication and I would have to have blood tests every few weeks to see how my liver was reacting to the medicine, etc! Very scary! I got a second opinion at a dermatologist...thank goodness I did! Not a fungus just some kind of infection. I got a shot and some antibiotics and the mail grew back, no issues! Good luck at the doc!