Trichophyton rubrum onychomycosis in a 17-year-old girl.

Onychomycosis is one of the most common nail disorders seen by dermatologists. An increasing number of immunocompromised patients, in combination with an aging worldwide population, has resulted in a significant increase in the incidence of this disorder. While nearly one fifth of all occurrences are found in patients aged 40 to 60, the incidence dramatically increases in patients over 60. However, onychomycosis is very uncommon in children.