Onychomycosis: therapy directed by morphology and mycology.

Onychomycosis is one of the most common nail disorders. Despite recent therapeutic advances with the introduction of effective systemic agents and transungual drug delivery systems, the incidence of onychomycosis is increasing. This is of concern, as the morbidity related to this infection also increases as our population ages with associated conditions, such as diabetes and immunosuppression from illness and medical therapy. Rational and effective treatment plans are needed.