Ingrown Toenails: Causes, Treatment & Podiatry Care

What it is

An ingrown toenail occurs when the corner or side of a toenail curls down and grows into the soft skin next to it. The big toe is by far the most common location — it bears the most weight and pressure during walking.

In medical terms it’s called onychocryptosis (from Greek: onycho = nail, crypto = hidden). The “ingrown” part is slightly misleading — the nail isn’t actually growing inward; rather, the skin and the nail are colliding, and the nail edge breaks the skin’s protective barrier.

The condition typically progresses through three stages:

1. Inflammation — the side of the toe is red, swollen, and tender. No drainage yet.
2. Infection — bacteria enter through the broken skin. Drainage, pus, increased pain, possible fever.
3. Granulation tissue — chronic cases develop a fleshy overgrowth of tissue alongside the nail.

Symptoms

Early signs:

• Tenderness along the side of the toenail, especially the big toe
• Redness and mild swelling at the nail margin
• Discomfort when wearing closed shoes or putting pressure on the toe

Later stages:

• Throbbing pain, particularly when standing or walking
• Pus, drainage, or bleeding from the nail margin
• A small bump of red, sometimes shiny tissue at the side of the nail (granulation)
• Fever or red streaks moving up the foot — signs of spreading infection

What causes it

The most common triggers:

• Cutting nails too short or rounding the corners — when the nail grows back, the corner can catch on the skin instead of growing past it
• Tight shoes that compress the toes
• Sports trauma — repetitive impact (running, soccer, ballet) or a single stub
• Naturally curved nail shape — some people are simply prone to it
• Improper nail clipping technique — using rounded nail scissors or “digging out” the corners
• Sweaty feet that soften the nail and surrounding skin
• Genetic predisposition

Certain conditions also increase risk: fungal nail infections, abnormal toe positioning (hammertoe, hallux valgus), and conditions affecting circulation or sensation.

Watch out — not every persistent “ingrown toenail” is actually an ingrown. If a painful nail border keeps returning despite repeat clipping and conservative care, especially in a younger person, the underlying problem may be a subungual exostosis — a small bone growth pushing up under the nail. A lateral X-ray makes the diagnosis.

Treatment options

Treatment depends on the stage. Mild cases can often be managed at home; established infections or recurrent cases need professional care.

At-home care for early/mild cases (no infection)

• Soak the foot in warm, soapy water for 15–20 minutes, two to three times daily
• Gently lift the nail edge with a small piece of cotton or dental floss tucked under it after soaking, to encourage the nail to grow above the skin
• Apply antibiotic ointment and a clean bandage
• Wear roomy, open shoes — sandals if possible — to avoid pressure
• Take over-the-counter pain relievers (acetaminophen or ibuprofen) as needed

Do not “dig out” the nail or attempt bathroom surgery. This usually makes things worse and increases infection risk.

If symptoms don’t improve within a few days, or if signs of infection develop, see a clinician.

Professional treatment

For infections, recurrent cases, or unrelenting pain, a podiatrist can perform a quick in-office procedure:

• Partial nail avulsion — under local anesthetic, the offending edge of the nail is removed. The toe heals over 2–4 weeks. The nail grows back in most cases.
• Partial nail avulsion with matrixectomy — same as above, but the underlying nail-growing tissue (matrix) at the affected edge is destroyed (chemically with phenol, or surgically). This permanently prevents that strip of nail from regrowing — typically used for recurrent ingrown nails. Success rate >90%.
• Antibiotics — for established infections, often given alongside the procedure
• Drainage of any abscess

The procedure itself takes 10–20 minutes, healing involves daily soaks and dressing changes, and most people return to normal shoes within a couple of weeks.

When to see a clinician

Make an appointment if:

• Pain is severe or limiting your ability to walk
• Drainage, pus, or significant redness is present
• The toe is hot to the touch or you have a fever
• This is a recurring problem
• The skin alongside the nail has developed a fleshy bump (granulation tissue)
• You have diabetes, peripheral artery disease, or any condition affecting circulation or sensation — even mild ingrown nails can become serious in this group, and you should not attempt at-home treatment

Prevention

The single most effective change: how you trim your nails.

• Cut straight across, not curved
• Don’t trim too short — leave a small amount of nail beyond the nail bed
• Use proper toenail clippers, not scissors or fingernail clippers
• Trim after a bath or shower when nails are softer
• Avoid tight shoes — particularly narrow toe boxes
• Wear properly-fitted athletic shoes for sports
• Keep feet dry to prevent the skin from softening
• If you’re prone to ingrown nails, consider seeing a podiatrist for routine nail care

A note for people with diabetes

Ingrown toenails in people with diabetes are not the same problem they are for everyone else. Reduced sensation can mask the early stages, reduced circulation impairs healing, and the consequences of an infected toe can include hospitalization or worse. Do not attempt at-home treatment — see a clinician at the first sign of any toenail problem.