Treatment For Subungual Verruca - A Wart From Viral Infection Beneath The Toenail.   

Viral infections of the skin and nail are spread through contact.  If you have dry, cracked skin on your feet you can pick it up from a surface that a person with plantar wart infection has walked on with bare feet.  A nail salon with poor sterilization and infection control technique can spread the virus from customer to customer.  It can be picked up that easily.  Without proper treatment it can spread to other areas of your body.