Onychomycosis is a fungal infection of the nail apparatus that typically develops gradually and progresses over time. It is commonly encountered in community pharmacy.
Understanding how infection develops and spreads supports accurate recognition, identification of contributing factors, and appropriate patient counselling1-3.
Onychomycosis affects one or more parts of the nail unit, including the nail plate, nail bed, or nail matrix. Infection usually begins at the distal edge of the nail or through the lateral nail folds, often following minor trauma that disrupts the protective nail barrier.
Once established, fungal organisms proliferate within the keratin-rich nail structure. Because nail growth is slow, spontaneous clearance is limited, allowing the infection to persist and gradually progress 1-3.
Several fungal organisms are implicated in onychomycosis 4, 5:
As the infection advances, visible and structural nail changes become more pronounced. These may include:
In more advanced cases, secondary bacterial colonization may contribute to malodor, particularly when debris accumulates beneath the nail plate 3, 4.
Fungi responsible for onychomycosis thrive in warm, moist, and enclosed environments. Transmission may occur through:
Onychomycosis can affect healthy individuals; however, several factors increase susceptibility and persistence 3, 6:
In people with diabetes, onychomycosis should not be regarded as a purely cosmetic condition. Nail thickening and infection may contribute to pressure points, skin breakdown, and secondary bacterial infection, thereby increasing the risk of diabetes-related foot complications
7-9.
Referral for medical or podiatric assessment should be considered in patients with diabetes, peripheral vascular disease, immunosuppression, or when infection is extensive or progressive.
Pharmacists play a central role in recognizing characteristic nail changes, identifying contributing factors and high-risk patients, explaining the chronic and progressive nature of infection, and facilitating timely referral when appropriate.
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