MSD Manual

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Onychomycosis
Onychomycosis
Onychomycosis

In the top photo, infection does not yet involve the entire nail plate (the hard part of the nail made of the protein keratin), and a chalky white scale is visible just beneath the nail surface. In the bottom photo, infection is more extensive and the nail is thickened, deformed, and yellow.

Images provided by Thomas Habif, MD.

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Onychomycosis