An ingrown toenail develops when the edge of a nail grows into the soft skin alongside it, causing pain, swelling, and sometimes infection. It’s one of the most common nail conditions, almost always affecting the big toe, and ranges from a minor annoyance you can treat at home to a problem that needs a small in-office procedure.
How an Ingrown Toenail Forms
The gap between the edge of your toenail and the skin groove it sits in is only about 1 millimeter wide. A thin layer of skin lines that groove and protects it from irritation. When something disrupts the fit, whether from trimming, pressure, or the natural curve of the nail, a sharp sliver of nail can press into or pierce that protective layer. Once the skin breaks, the body treats the nail edge like a foreign object, triggering inflammation and pain.
This process usually happens gradually. You might notice mild tenderness at first, then increasing redness as the nail digs deeper. If bacteria get into the broken skin, infection follows.
Common Causes
The most frequent trigger is the way you cut your nails. Trimming them too short or rounding the corners encourages the nail to curve downward into the skin as it grows back. Tight shoes and socks are another major cause: anything that squeezes your toes pushes the skin against the nail edge, especially during long periods of walking or standing. Other causes include stubbing your toe or dropping something on it, repetitive pressure from sports like running or soccer, and naturally thick or curved nails that you may have inherited.
Stages of Severity
Ingrown toenails are typically described in three stages, and knowing which one you’re dealing with helps determine what to do about it.
In the first stage, the skin alongside the nail is slightly red and swollen, and it hurts when you press on it. The nail edge is irritating the skin but hasn’t broken through in a serious way. This is the stage where home care is most effective.
In the second stage, the redness and swelling are more pronounced, and you’ll likely see fluid or pus draining from the area. The skin is warm to the touch. Infection has set in, and the pain is no longer limited to direct pressure; it may throb on its own.
By the third stage, the irritated tissue has started forming a bump of raw, beefy-red granulation tissue that bleeds easily. The skin fold alongside the nail may be visibly overgrown, and discharge is usually persistent. At this point, the problem won’t resolve without professional treatment.
Signs of Infection
An infected ingrown toenail produces a few unmistakable signals: the skin around the nail becomes red and warm, pus builds up (sometimes forming a visible white or yellowish pocket), and the pain intensifies noticeably. In some cases the drainage has a foul smell. Left untreated, the infection can spread deeper into the toe, and the nail itself may become discolored, ridged, or brittle. In rare cases the nail loosens from the nail bed entirely.
Home Care for Mild Cases
If you’re in that first stage, with mild redness and tenderness but no pus, you can usually manage it at home. The standard approach is soaking the affected foot in warm water with Epsom salt, about one tablespoon per liter of water, for 15 to 20 minutes at a time. Do this two to three times a day. The warm soak softens the skin around the nail, reduces swelling, and helps keep the area clean.
After each soak, gently dry the toe and try to ease a small piece of clean cotton or dental floss under the nail edge to lift it away from the skin. Wear open-toed shoes or sandals when possible to minimize pressure. If the redness spreads, the pain worsens, or you see pus developing after a few days of home care, it’s time for professional treatment.
When a Procedure Is Needed
For stage two and three ingrown nails, the most common treatment is a partial nail avulsion. This is a quick in-office procedure done under local anesthesia. Your doctor numbs the toe, then removes a narrow strip of nail along the offending edge. The pain relief is often immediate once the pressure on the skin is gone.
If the problem keeps coming back, a chemical called phenol is applied to the exposed nail root after the strip is removed. This destroys the cells that produce that portion of the nail, preventing it from regrowing. Adding this step significantly reduces the chance of recurrence compared to simply removing the nail strip alone. Your nail will be slightly narrower afterward, but the difference is barely noticeable.
Recovery After a Procedure
If only part of the nail was removed, healing typically takes six to eight weeks. A full nail removal takes eight to ten weeks. For the first few days after the procedure, the toe is bandaged, and you’ll return to have it checked and redressed around day three. After that, the routine is straightforward: clean the site daily after showering with salt water, apply antiseptic ointment, and cover it with a simple dressing until it’s fully healed, usually within two to three weeks of the procedure itself.
During recovery, wear shoes with room in the toe box. Tight shoes can irritate the healing tissue and slow things down. Most people can walk normally right away, though the toe may be sore for the first day or two.
Why Diabetes Raises the Stakes
People with diabetes face a higher risk of developing ingrown toenails and a greater chance of complications when they do. Nerve damage in the feet, common in long-standing diabetes, can mask pain signals, meaning an ingrown nail may progress to a serious infection before it’s even noticed. Reduced blood flow compounds the problem: one study found peripheral arterial disease in nearly 47% of diabetic patients with ingrown nails, which significantly slows wound healing. If you have diabetes, even a mildly ingrown nail warrants prompt professional attention rather than home treatment.
Preventing Ingrown Toenails
The single most effective prevention measure is cutting your toenails straight across rather than rounding the corners. The American Academy of Dermatology recommends this technique specifically to reduce ingrown nail risk. Keep nails at a moderate length, roughly even with the tip of the toe. Cutting them too short exposes the nail bed and lets surrounding skin fold over the edges as the nail grows back.
Footwear matters just as much. Shoes with a wide toe box give your toes room to sit naturally without pressing against each other or the shoe walls. Pointed-toe shoes, heels, and athletic shoes that are a half-size too small all concentrate pressure on the big toe. If your feet swell during the day (and most people’s do), shop for shoes in the afternoon when your feet are at their largest. Keeping your feet clean and dry also helps maintain the integrity of the skin around the nail, making it less vulnerable to irritation.