An ingrown toenail occurs when the edge of a nail, usually on the big toe, grows into the surrounding skin instead of over it. This causes pain, swelling, and redness along the nail border. It’s one of the most common nail conditions, and while mild cases often resolve at home, more advanced ones can become infected and require a minor procedure.
How an Ingrown Toenail Develops
The nail doesn’t literally change direction. What happens is the skin alongside the nail gets pressed into the nail edge, or a small spike of nail left after trimming digs into the soft tissue as it grows. The big toe is the most common site because it bears the most pressure during walking, but any toenail can be affected.
Clinically, ingrown toenails are graded in three stages. Stage 1 involves mild redness, slight swelling, and pain when pressure is applied. Stage 2 brings more noticeable swelling, infection, and discharge. Stage 3 is the most advanced: the irritated tissue forms a mound of raised, raw-looking tissue (called granulation tissue) alongside the nail, with significant redness and drainage. Understanding which stage you’re in helps determine whether home care is enough or a procedure is needed.
What Causes Ingrown Toenails
The most common cause is cutting your nails too short. When the nail is trimmed below the tip of the toe, the skin next to it folds over the nail edge, and the nail grows back into that fold. Rounding the corners of the nail is another frequent trigger, because it leaves a small spur that curves downward into the skin as it extends.
Tight or short shoes and socks push the skin against the nail from the outside, creating the same problem without any trimming mistakes. Activities that put repeated pressure on the toes, like running or kicking, increase risk for the same reason. A single trauma, such as stubbing your toe hard or dropping something on it, can also start the process by disrupting the nail’s normal growth path.
Some people are simply more prone to ingrown toenails because of their nail shape. Nails that are naturally very curved (sometimes called pincer nails) press into the skin more easily. Fungal infections that thicken or distort the nail also increase the likelihood, as does losing a nail entirely from injury, since the replacement nail may grow back irregularly.
What It Feels Like
Early on, you’ll notice tenderness along one side of the nail, especially when wearing shoes or bumping the toe. The skin next to the nail looks slightly red and feels swollen. At this point it’s uncomfortable but manageable.
If it progresses, the pain becomes more constant and the area may feel warm to the touch. You might see yellowish or white fluid seeping from the nail border, which signals that the body is fighting a localized infection. The skin can become tight and shiny from swelling. In advanced cases, the irritated tissue bleeds easily and grows outward in a puffy, bumpy mass that partially covers the nail edge. At that point, wearing closed shoes is genuinely painful, and the toe may throb at rest.
When It Becomes Infected
Not every ingrown toenail gets infected, but the broken skin creates an easy entry point for bacteria. Signs of infection include pain that worsens instead of improving, redness that spreads beyond the immediate nail border, skin that feels hot, and pus building up under the skin or draining from the side of the nail. A pus-filled pocket may form as a visible white or yellow area near the nail fold.
Infection is more of a concern for people with diabetes or poor circulation, because reduced blood flow to the feet slows healing and makes it harder for the immune system to fight bacteria in that area. For these individuals, even a mild ingrown toenail warrants professional attention rather than home management.
Home Care for Mild Cases
Stage 1 ingrown toenails often respond well to home treatment. The Mayo Clinic recommends soaking the affected foot in warm, soapy water for 10 to 20 minutes, three to four times a day, until the toe improves. The soaking softens both the nail and the surrounding skin, reducing the pressure where the two meet. After soaking, gently push the swollen skin away from the nail edge using a clean cotton swab.
Some people place a tiny piece of clean cotton or dental floss under the corner of the nail to lift it above the skin as it grows out. If you try this, change the material daily to prevent bacteria from accumulating. Wear open-toed shoes or sandals when possible to avoid compressing the toe, and keep the area clean and dry between soaks. Over-the-counter pain relievers can help manage discomfort during this period.
If you don’t see improvement within a few days, or if the redness and swelling are getting worse, home care alone isn’t going to resolve it.
Procedures for Persistent or Severe Cases
For stage 2 and stage 3 ingrown toenails, a minor procedure is more effective than continued conservative care. The most commonly performed treatment is partial nail avulsion with chemical treatment of the nail root. Under local anesthesia, the portion of nail digging into the skin is removed, and a chemical is applied to the exposed nail root to prevent that strip of nail from growing back.
This approach has strong success rates. Studies tracking patients for up to 33 months after the procedure found recurrence rates between 1% and 4.3%. By comparison, removing the nail strip without treating the root has a much higher failure rate. One comparison found that roughly one in 25 patients had a recurrence with chemical treatment, versus eight out of 21 without it.
Recovery is straightforward. You’ll typically return for a wound check at three days and again at one week. After the initial check, the routine involves cleaning the site daily with salt water after showering and applying a simple dressing. Full healing takes about two to three weeks. The toe looks cosmetically normal afterward, just slightly narrower at the treated edge, and most people return to regular shoes within a couple of weeks.
Other surgical options exist for complex or repeatedly recurring cases, including procedures that reshape the skin fold beside the nail or remove the nail entirely. These are less common and reserved for situations where simpler approaches have failed.
How to Prevent Ingrown Toenails
The single most important prevention step is how you cut your toenails. The American Academy of Dermatology recommends cutting straight across rather than rounding the corners. Leave enough length so the nail edge sits roughly even with the tip of the toe. Cutting too short forces the skin to overlap the nail as it regrows.
Shoes should have enough room in the toe box that your toes aren’t compressed. If you can’t wiggle your toes comfortably, the shoes are too tight. This is especially relevant for athletes, who should ensure their athletic shoes fit properly and aren’t a half-size too small. Keeping toenails at a moderate length (not too long, not too short) and addressing fungal infections promptly also reduces your risk over time.