Onychomycosis may be classified based on clinical features.
Type
Features
white superficial (WSO)
superficial white patches on the outer surface of the nail plate, usually with distinct edges
distal and lateral subungual (DLSO)
involves the distal and/or lateral nailbed initially, eventually involves the nail plate
proximal subungual (PSO)
portal of entry is the cuticle and/or ventral aspect of the proximal nail fold, sometimes with paronychia
endonyx
superficial and deep penetration of the nail plate without changes to the nail bed
total dystrophic
complete dystrophy of the nail plate
Mixed
sharing features with more than 1 of the above types
Distal and lateral subungual onychomycosis (DLSO) is the most common type.
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Specialty: Infectious Diseases, Dermatology
