Signs of Toenail Fungus vs. Nail Damage from Polish (Phoenix Podiatrist Guide)

Color, thickness, or other changes in your toenails can be scary, especially if you’re not sure whether it’s a fungus or just damage from polish or gel. As a Phoenix podiatrist, I see these changes often in my patients. Knowing the difference helps you keep your nails healthy.

What Is Toenail Fungus?

Toenail fungus (onychomycosis) is an infection that grows under the toenail

Common signs:

• Yellow, white, or brown streaks starting at the tip or sides of the nail

• Thickening or crumbling edges

• Nails lifting off the nail bed

• Smell or odor, especially when trimmed

• Spreads slowly, often starting on one nail

💡 Tip: Toenail fungus thrives in warm, moist places like shoes and nail salons, gym and lockeroom floors if not properly cleaned.

What Is Nail Damage from Polish?

Frequent or long-term use of polish, gel, or acrylics can stress your nails.

Common signs of toenail polish damage:

• White patches or roughness after polish removal

• Peeling or splitting layers of the nail

• Color change that matches the polish shape

• Nails feel thin or brittle, but usually don’t lift or smell

Damage usually improves once you stop polish for a few weeks.

Key Differences at a Glance

Feature	Fungus	Polish Damage
Color pattern	Irregular yellow/brown streaks	Even stain where polish sat
Texture	Thick, crumbly	Thin, peeling
Odor	Possible mild odor	None
Progression	Worsens over time	Grows out with new nail
Pain	Sometimes mild pressure	Rare

When to See a Podiatrist

Schedule a visit if:

• If the toenail keeps getting worse

• You see your toenail getting thicker, lifting, or building up underneath the nail

• There’s pain, redness, or swelling

• You’re just not sure of what's going on, and want peace of mind

A quick evaluation lets us confirm with an exam and possibly a nail biopsy, to start any treatments needed.

Treatment Options

• For fungus: Laser therapy, oral/topical antifungals, and nail restoration (KeryFlex) for cosmetic improvement.

• For polish damage: Trim, moisturize, and protect as the new nail grows; avoid harsh nail removers, like 100% acetone

🩺 Book a consultation to learn which option fits your nail health goals.

Preventing Future Problems

• Choose salons that sterilize tools.

• Wear flip-flops in gyms and pools.

• Give nails a “breather” between polishes.

• Keep feet dry and socks clean.