Gel polish does not directly cause nail fungus, but it creates conditions that make fungal infections more likely. The real culprits are damage to the nail during application or removal, moisture trapped under lifted polish, and unsanitary salon tools. A 2025 study of 273 women who regularly used nail cosmetics found that 57.5% had lab-confirmed fungal nail infections, highlighting just how common the problem is among frequent salon clients.
How Gel Polish Sets the Stage for Fungus
Fungal organisms don’t come from the gel itself. They’re already present in your environment, on skin surfaces, and on shared salon tools. What gel polish does is create opportunities for those organisms to take hold. The process works in a few key ways.
First, the nail plate often gets thinned during preparation and removal. Filing the nail surface for better adhesion, and especially scraping or peeling off old gel, strips away protective layers of the nail. A thinner, weaker nail is easier for fungi to penetrate. Second, when gel polish begins to lift or peel at the edges (a near-inevitability as it grows out), tiny gaps form between the polish and the nail. These warm, dark, slightly moist pockets are ideal environments for fungal growth. The polish sitting on top seals everything in, so you can’t see or feel what’s developing underneath.
The most significant risk factor is onycholysis, which is when the nail separates from the nail bed. This can happen from mechanical trauma during aggressive filing, prying tools under the free edge of the nail, or an allergic reaction to chemicals in the gel system. Once the nail lifts, a cavity forms underneath where infectious organisms grow quickly. The seal at the fingertip (called the hyponychium) acts as a barrier against pathogens, and if that seal is broken during a manicure, bacteria and fungi have a direct path in.
What the Fungus Actually Looks Like
Nail fungus typically starts as a white or yellow-brown spot under the tip of the nail. As the infection progresses, the nail may thicken, become discolored (white, yellow, green, or brown), turn brittle or crumbly at the edges, change shape, or develop an unpleasant smell. In advanced cases, the nail separates from the bed entirely.
The tricky part with gel polish is that opaque colors hide these early signs completely. You might go weeks or months without noticing a developing infection because the polish is covering it. By the time you remove the gel and see what’s underneath, the fungus may have progressed well beyond its earliest stage. This is one reason dermatologists recommend taking breaks between gel applications: it gives you a chance to inspect your nails.
Keratin Granulations vs. Actual Fungus
Not every white spot after removing gel polish is fungus. Keratin granulations are small, chalky white patches or rough spots caused by the polish drying out and weakening the nail surface. They’re cosmetic damage, not an infection. The confusion arises because a type of fungal infection called superficial white onychomycosis also causes chalky white spots that look nearly identical. The key differences: keratin granulations are surface-level, don’t spread, and improve on their own within a few weeks. Fungal infections tend to worsen over time, may cause thickening or crumbling, and won’t resolve without treatment. If white spots persist or your nail starts changing texture, that’s worth getting checked.
Which Fungi Are Responsible
About 90% of toenail and 75% of fingernail fungal infections are caused by a group of fungi called dermatophytes, organisms that feed on keratin (the protein your nails are made of). The most common species are the ones that thrive in warm, enclosed spaces, which is exactly what a sealed gel manicure provides.
Yeast infections, particularly Candida, account for a smaller share of nail infections but are especially relevant to gel polish users. When onycholysis creates a gap under the nail, Candida is one of the most common opportunistic organisms to move in. This is more typical of fingernails than toenails, which makes it particularly relevant to manicure-related infections.
Do UV Lamps Kill Fungus?
You might assume the UV or LED lamp used to cure gel polish would sterilize the nail and kill any lurking fungi. Research on ultraviolet light and nail fungi tells a more complicated story. UV-A and UV-B light (the types used in nail lamps) can reduce fungal colony growth, but they do not eliminate it. Continuous exposure at the wavelengths and intensities used in nail curing lamps did not completely suppress growth of the most common nail fungi in laboratory testing. Fungal spores are particularly resistant because their DNA is shielded by a concentrated cell structure and pigmented walls, requiring much higher UV energy than a nail lamp delivers. The brief curing sessions during a gel manicure (typically 30 to 60 seconds per coat) provide nowhere near enough exposure to act as sterilization.
Salon Practices That Raise Your Risk
The difference between a gel manicure that stays healthy and one that leads to infection often comes down to technique and hygiene. Rough filing that thins the nail excessively, aggressive scraping during removal, and tools pushed too forcefully under the nail edge all create the micro-damage fungi exploit. Salons that don’t properly sterilize implements between clients can transfer organisms from one person’s nails to the next.
Proper nail preparation before gel application includes dehydrating and sanitizing the nail surface, which removes surface oils and reduces microbial load. But this step protects adhesion more than it prevents infection over the weeks the polish is worn. The real protection comes from gentle handling: using a nail drill at appropriate speed and pressure, soaking off gel rather than peeling or prying it, never applying gel over a nail that’s already showing signs of lifting or damage, and allowing the nail to fully reattach to the nail bed after any episode of separation before recoating.
What to Do if You Suspect an Infection
If you remove your gel polish and see discoloration, thickening, crumbling, or an unusual smell, the first step is to leave the nail bare. Do not reapply gel or any nail coating over a nail that may be infected. Recoating traps the organism and lets it continue growing unchecked. Applying antifungal treatment directly to the nail is most effective when the medication can reach the infection site without a layer of cured polymer in the way. In some cases, a healthcare provider may recommend temporarily removing the nail to allow direct treatment of the nail bed underneath.
Nail fungus is slow to resolve because nails grow slowly. Fingernails take about six months to fully replace themselves, and toenails can take a year or more. Treatment needs to continue for the full duration of new nail growth, which is why catching the problem early, before it spreads deeper, makes a significant difference in how long you’re dealing with it.
Reducing Your Risk
Taking a one to two week break between gel applications lets you monitor the condition of your nails and gives the nail plate time to recover from any thinning. During the break, look for discoloration, white patches that don’t improve, changes in nail texture, or any separation from the nail bed.
- Choose soak-off removal over peeling or scraping. Acetone wraps dissolve the gel without mechanical force on the nail surface.
- Watch for lifting. If your gel starts peeling up at the edges before your next appointment, get it removed rather than waiting. That gap is where infections start.
- Check salon sterilization. Tools that contact the nail should be autoclaved or single-use. Nail files and buffers should not be reused between clients.
- Keep nails dry. Moisture under a sealed coating accelerates fungal growth. If your hands are frequently in water, gel manicures carry more risk.
- Skip the manicure if a nail is damaged. Any nail with visible separation, soreness, or unusual color should be left uncoated until it’s fully healthy.