Subungual Exostosis: The Painful Bony Growth Beneath the Toenail

Quick answer:A subungual exostosis is a benign bony growth under the toenail — most often the big toe — that lifts or deforms the nail and causes pain. An X-ray confirms it, and a podiatrist can remove it with a minor in-office procedure when it is painful or persistent. Call (810) 206-1402.

Medically Reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatrist, Balance Foot & Ankle Specialists, Michigan. Last updated April 2026.

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Max-cushion everyday shoe — podiatrist favorite for walking and running.

PowerStep Pinnacle Insole

The podiatrist-recommended over-the-counter orthotic.

OOFOS Recovery Slide

Impact-absorbing recovery sandal — wear after long days on your feet.

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General Foot Care - Balance Foot & Ankle

When to See a Podiatrist

If foot or ankle pain has been bothering you for more than a few weeks, home care alone may not be enough. Balance Foot & Ankle offers same-week appointments at our Howell and Bloomfield Township clinics — no referral needed in most cases. Bring your current shoes and a short list of symptoms and we’ll build you a treatment plan in one visit.

Call Balance Foot & Ankle: (810) 206-1402  ·  Book online  ·  Offices in Howell & Bloomfield Township

In-Office Treatment at Balance Foot & Ankle

If home treatment isn’t providing relief for your foot and ankle conditions, our podiatry team at Balance Foot & Ankle can help with same-day evaluations and advanced in-office care.

Doctor Hoy’s Natural Pain Relief Gel

Natural topical pain relief I use in our clinic. Arnica + camphor formula — apply directly to the area 3–4x daily. ($20–25)

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Frequently Asked Questions

How long does it take a toenail to grow back?

6-12 months for a full big toenail. Smaller toenails 4-6 months. Speed varies with age, circulation, and nutrition.

Will this affect other nails?

Trauma affects only the injured nail. Fungal infection can spread without treatment. Systemic causes affect multiple nails simultaneously.

Should I cover the nail or leave it open?

Cover with a breathable bandage during work or activity. Leave open at night for healing. Keep dry and clean.

Balance Foot & Ankle surgeons are affiliated with Trinity Health Michigan, Corewell Health, and Henry Ford Health — three of Michigan’s largest health systems.