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Onychomycosis is fungal infection of the nails[1][2]. It is classically difficult to treat requiring prolonged courses of antifungal agents. Childhood onychomycosis is increasing in incidence in Western countries.



  • Subungual onychomycoses start at the distal free edge of the toenails.
    • Yellow streaks suggest fungal matrix involvement.
    • Proximal subungual onychomycosis suggestive of immuno-suppression
  • White superficial onychomycosis
  • Endonychial onychomycosis
    • Hyperkeratotically thickened nails with white discolouration
  • Total dystrophic onychomycosis (TDO)
    • Most severe variant of onychomycosis.
  • Onychia et paronychia candidosa
    • Caused by yeasts
    • Often after bacterial paronychia.