- Fungal infection of the nails. Fungal infections can involve either the toenails or the fingernails. Nail fungal infection is usually caused by the dermatophyte fungi Trichophyton rubrum which can invade the nail bed. See dermatophytic onychomycosis.
* * *Very common fungus infections of the nails, causing thickening, roughness, and splitting, often caused by Trichophyton rubrum or T. mentagrophytes, Candida, and occasionally molds. SYN: ringworm of nails. [onycho- + G. mykes, fungus, + -osis, condition]
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* * *n.fungus infection of the nails caused by dermatophyte or Candida. The nails become yellow, opaque, and thickened. See also ringworm.
* * *on·y·cho·my·co·sis (on″ĭ-ko-mi-koґsis) fungal infection of the toenails or fingernails. It usually is seen first as white patches or pits on the surface or around the edges of the nails, followed by infection beneath the nail plate. Called also dermatophytic o., tinea unguium, and ringworm of the nail.
Onychomycosis and lifting of the nail plate.
Medical dictionary. 2011.