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Fungal infection of the nails, called onychomycosis, may affect one or several toenails or fingernails. These are common infections, primarily caused by dermatophytes — the same family of fungi responsible for athlete’s foot. Fungi thrive in warm, moist, dark environments, which is exactly what a shoe provides, so the toenails are affected far more often than the fingernails. As the infection takes hold, the nail becomes thick, discolored (yellow, brown, or white), brittle, and prone to crumbling, and it may lift away from the nail bed or give off an odor.

What Increases Your Risk

Why Nail Fungus Is Hard to Treat at Home

The infection lives inside and underneath the nail plate, where over-the-counter creams and polishes struggle to reach. That is why fungal nails often persist for months or years and spread to neighboring nails. A podiatrist can confirm the diagnosis — sometimes with a simple nail sample, since other conditions like psoriasis can look similar — and match the treatment to the severity.

Treatment Options at Family Foot & Leg Center

When to See a Podiatrist

If over-the-counter products have not cleared the problem, or if you have diabetes or poor circulation, have the nails evaluated. Thick, discolored nails are not just cosmetic — they can crack the skin and open the door to more serious infection.

For more information or to schedule an evaluation with a board-certified foot and ankle specialist, call (239) 430-3668 (FOOT) or book online at NaplesPodiatrist.com.


Serving Southwest Florida since 2005, Family Foot & Leg Center has 9 convenient locations throughout Collier, Lee, Charlotte, and Sarasota Counties — Naples, Estero, Fort Myers, Cape Coral, Port Charlotte, and Sarasota. We provide pediatric to geriatric foot and ankle care: ingrown toenails, heel pain, bunions, foot & ankle arthritis, plantar fasciitis, foot & ankle surgery, custom orthotics, and diabetic wound care — with in-office X-rays, diagnostic ultrasound, and minor surgical suites. Home of the Lam Minimally Invasive No-Scar Bunion Surgery. Same-day appointments and easy online scheduling.

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Written by Dr. Kevin Lam, D.P.M., F.A.C.F.A.S.

Dr. Kevin Lam, DPM, FACFAS, DABLES, DABPS is Clinical Director of Family Foot and Leg Center, PA — Southwest Florida's premier podiatric practice. He earned his Doctor of Podiatric Medicine degree with honors from Temple University School of Podiatric Medicine and completed advanced surgical training at Mount Sinai Medical Center and Jackson Memorial Health System, Miami. Named among America's Top Podiatrists. Board-certified in foot surgery, reconstructive rearfoot and ankle surgery, and lower extremity surgery. Serving Southwest Florida since 2005 across 9 locations from Marco Island to Sarasota.

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