Definition & OverviewWhat Is Onychomycosis?
Nail fungus, medically known as onychomycosis (from the Greek "onycho" meaning nail and "mycosis" meaning fungal disease), is an infection caused by an overgrowth of fungi in the nail bed or matrix. It is the most common nail disorder, affecting approximately 10% of the general population worldwide — and up to 50% of adults over age 70.
The infection most commonly affects toenails, where the warm, dark, moist environment inside footwear provides ideal conditions for dermatophyte fungi.
Types of Nail Fungus Infections
Distal-Lateral Subungual
DLSOMost common type. Starts at the nail tip or sides and progresses toward the cuticle. Caused primarily by Trichophyton rubrum.
White Superficial
WSOAffects the nail surface only, appearing as white powdery patches. Generally responds better to topical botanical care.
Proximal Subungual
PSOStarts near the cuticle and moves outward. Often seen in individuals with compromised immune systems.
Candidal Onychomycosis
CandidaFungal infection caused by Candida yeast. More common in fingernails frequently exposed to moisture.