Wikipedia: Onychomycosis - Encyclopedia article with photographs and information on this common fungal disease that can affect toenails or fingernails. NHS Choices: Fungal Nail Infection - Provides a short video on foot care and details of symptoms, causes, diagnosis, treatment and complications. eMedicine: Onychomycosis - Detailed article by Dr Antonella Tosti including many photographs. American Family Physician: Treating Onychomycosis - Detailed information for clinicians about the efficacy of various treatments. Mayo Clinic: Nail Fungus - Symptoms, when to consult a doctor, treatment, prevention. Patient UK: Fungal Nail Infection - Factsheet on these infections, their causes, symptoms, treatment and prevention.