The appearance of infected nails will vary according to the infecting organism. Particular note should be made of the extent of any infection, whether it affects adjacent skin and the number of nails infected. Evidence of previous trauma or damage to the affected nails should be sought.
As the disease progresses the nail unit appears thick, brittle and discoloured, often with a yellow hue. There may be associated onycholysis and paronychial inflammation (1). Onychomycosis can be classified clinically into:
Distal and lateral subungual onychomycosis (DLSO)
Superficial white onychomycosis (SWO)
Proximal subungual onychomycosis (PSO)
Total dystrophic onychomycosis
Reference:
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