Here's What Happens If You Don't Wash Your Feet, Says a Medical Doctor Distal subungual onychomycosis is the ... causing the infection are distal and lateral involvement of the nail, complete ...

longitudinal pigmented band (melanonychia striata), onychomycosis, and subungual exostosis. An x-ray of the distal digit should be performed if a fracture of the underlying phalynx is suspected.

Most children with onychomycosis have distal subungual onychomycosis, which requires systemic treatment. For this reason, the diagnosis of onychomycosis should always be confirmed by mycology culture.