Acrylic nails are popular for good reason — they're durable, long-lasting, and let you experiment with shapes and lengths your natural nails might not support. But there's a well-known downside that nail technicians and dermatologists see often: a fungal infection developing quietly underneath the acrylic, sometimes for weeks before it's even noticed, because the artificial nail hides it from view.
Why Acrylics Make Fungal Infections More Likely
Fungus thrives in warm, dark, moist environments, and an acrylic nail creates almost exactly that setting over your natural nail bed. A few specific factors compound the risk:
Trapped Moisture
Even a small amount of water that gets underneath the acrylic during showering, dishwashing, or swimming has nowhere to evaporate. That trapped moisture creates a humid microenvironment that fungal organisms, most commonly dermatophytes or yeasts like Candida, can exploit.
A Gap or Lift Between the Acrylic and Natural Nail
Over time, especially as the natural nail grows out, a small gap can form between the acrylic and the nail bed. This gap is essentially an open invitation for moisture and fungal spores to settle in, away from light and air that would otherwise discourage fungal growth.
Micro-Damage From Application and Removal
The filing and buffing involved in applying and removing acrylics can thin the natural nail plate or create tiny breaks in its surface. These micro-injuries give fungi (and sometimes bacteria) an easier entry point than an undisturbed, intact nail would offer.
Shared or Improperly Sanitized Tools
Nail files, buffers, and cuticle tools that aren't properly sterilized between clients can transfer fungal spores from one person to another. This is one of the more preventable contributors, and it's worth asking any salon about their sanitation practices.
How to Tell If It's Fungus
A few signs distinguish a fungal infection from ordinary nail damage or polish staining:
- Color: Yellow, green, white, or brown discoloration of the natural nail itself (not just the acrylic) is a hallmark sign
- Texture changes: Thickening, crumbling, or a chalky, rough texture to the nail underneath
- Odor: A noticeable, often unpleasant smell when the acrylic is removed
- Separation: The natural nail lifting or separating from the nail bed
- Pain or tenderness: Some, though not all, fungal infections cause mild discomfort around the nail
By contrast, mechanical damage from acrylics — thinning, dents, peeling layers — usually doesn't come with discoloration or odor, and tends to grow out cleanly without spreading.
Why It's Often Caught Late
Because the acrylic physically covers the natural nail, infections frequently progress for weeks or months before they're noticed, often only surfacing when the acrylic is removed or lifts on its own. By that point, the infection may be more established and take longer to clear than if it had been caught early on bare nails.
Who's More Prone to This
- People who get frequent, back-to-back acrylic fills without giving nails a break
- People with diabetes or circulation issues, both of which can impair the body's ability to fight off fungal infections
- Anyone with frequently wet hands from work or household tasks
- People with a history of athlete's foot or other fungal infections elsewhere, since fungal spores can spread between body areas
- Those with a weakened immune system or certain skin conditions like psoriasis affecting the nails
Treatment Options
Remove the Acrylic First
This is the necessary first step. Leaving an infected nail covered traps moisture and blocks topical treatments from reaching the infection, essentially guaranteeing it won't improve regardless of what treatment is used afterward.
Topical Antifungal Treatments
For mild infections, prescription or medical-grade topical antifungal lacquers applied directly to the nail can be effective, though they generally require consistent, long-term use, since they need to penetrate the nail plate.
Oral Antifungal Medication
For more established infections, a doctor may prescribe oral antifungal medication, which tends to clear the infection faster and more reliably than topical treatment alone, since it reaches the nail bed through the bloodstream rather than having to penetrate from the surface. Oral antifungals do require monitoring for potential side effects and aren't appropriate for everyone, so this requires a doctor's evaluation.
Keeping Nails Dry and Trimmed
While treating an active infection, keeping nails short, dry, and exposed to air supports faster resolution and reduces the chance of reinfection or spread to nearby nails.
How to Prevent It Going Forward
- Give your natural nails periodic breaks between acrylic applications, ideally a few weeks every few months
- Choose salons with visibly clean, well-maintained tools, and consider bringing your own file and buffer if you're a frequent client
- Dry your hands thoroughly after washing, and avoid prolonged water exposure with acrylics on when possible (gloves for dishes and cleaning help)
- Address any lifting or gapping of the acrylic promptly rather than waiting for your next scheduled fill
- Keep an eye on the edges and underside of the acrylic for any early discoloration during regular fills
- If you have diabetes or a compromised immune system, talk to a doctor about extra precautions before getting frequent acrylics
When to See a Dermatologist or Doctor
If you notice discoloration, odor, or thickening under an acrylic, it's worth having it evaluated rather than just covering it with a fresh set. A dermatologist can often diagnose a fungal infection on sight, though they may take a nail clipping to confirm the specific organism involved, which can guide more targeted treatment, especially for infections that don't respond to first-line treatment.
It's also worth mentioning if you've noticed any related skin changes elsewhere, since some fungal nail infections are connected to broader skin conditions. Our article on whether poor gut health can cause skin problems in adults covers a different but sometimes overlapping pattern of skin and nail-related symptoms worth understanding as part of your overall health picture.
Frequently Asked Questions
Fungal infections typically cause yellow, green, white, or brown discoloration, a foul odor, and gradual thickening or crumbling of the natural nail, while mechanical damage tends to cause thinning, dents, or peeling without discoloration or odor.
Most nail specialists and dermatologists recommend removing the acrylics and pausing new applications until the infection clears, since covering an infected nail traps moisture and prevents treatments from working effectively.
Fingernail fungal infections typically take a few months to fully clear with consistent treatment, given the nail's slow regrowth, though oral antifungal medications often show improvement sooner than topical treatment alone.
If skin and nail symptoms seem connected to broader digestive health, our piece on whether poor gut health can cause skin problems in adults covers an overlapping pattern, and the skin and beauty hub has more nail and skin guides.