Pseudoleukonychia

Exogenous white stains and particularly superficial white onychomycosis (Jessner’s leukonychia trichophytica) cause white nails. In temperate climates the cause of superficial white onychomycosis is usually Trichophyton mentagrophytes, but in hot and humid climates also moulds such as Fusarium species may infect the surface of the nail plate. The nail is white and opaque also in proximal subungual onychomycosis and endonyx onychomycosis. Long-term application of nail varnish, layer over layer without prior removal of previous lacquer, may cause a peculiar softening and white colour of the nail surface

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