Fungal Nails (Onychmycosis) cause nail changes leading to yellowed, thickened and crumbly nails that are both cosmetically unappealing and potentially dangerous. The athlete's foot fungus is to blame in most cases and this infection is difficult to treat unless you are using a treatment designed to penetrate the nail plate itself. Believe it or not Vick's Vapor Rub, Tea Tree Oil and other home remedies are rarely effective and can only delay the proper diagnosis and treatment. If you are being treated for diabetes it is even more important to treat the infection in order to prevent wound complications that can be casued Get in to see your podiatrist today to have the proper diagnosis made and discuss new options for treatment!