Dermatophytosis(ringworm of the nails, onychomycosis, tinea unguium) is a fungal infection of the toe or the fingernails and may involve any part of the nail. Though not life threatening, it can cause a lot of pain, discomfort and even disfigurement. Infected nails tend to appear 'chalky', irregular in appearance or have thickened and sometimes discolored appearance.
Attribution: Avallain