An ingrown toenail happens when the edge of your nail curves down and presses into the skin alongside it, and the earliest sign is usually a focused tenderness right where the nail meets the skin on one or both sides of the toe. If pressing lightly on that spot causes a sharp, disproportionate pain, and the skin looks puffy or slightly red compared to your other toes, you’re almost certainly dealing with one.
What It Looks and Feels Like Early On
In the mildest stage, you’ll notice a hard, swollen area along one side of the toenail, most commonly the big toe. The skin there feels tender when anything touches it, including your shoe, your bedsheet, or your own finger. You might not see much at first, just a slight puffiness or redness (or a darker color change on deeper skin tones) along the nail border.
Look closely at the edge of the nail. If it seems to disappear into the skin rather than sitting on top of it, that’s the nail growing inward. Sometimes you can see a small ridge of skin starting to creep over the nail’s edge. The toe will look noticeably different from the same toe on your other foot, which is one of the simplest ways to confirm what you’re seeing.
How It Progresses Without Treatment
Ingrown toenails move through roughly three stages, and knowing where you are helps you decide what to do next.
In the first stage, you have mild swelling and pain that mostly shows up when pressure is applied. The skin is irritated but intact. This is the stage where home care, like soaking the foot in warm water and gently lifting the nail edge, can resolve things.
In the second stage, the irritation has turned into a real infection. The skin is significantly swollen, red, and warm to the touch. You’ll likely see discharge, a yellowish or whitish fluid seeping from the nail border. The pain shifts from pressure-dependent to more constant, sometimes throbbing even when you’re sitting still.
In the third stage, the body starts building extra tissue around the wound. You’ll see a small, raw-looking mound of flesh (called granulation tissue) forming along the nail edge, and the skin fold next to the nail becomes visibly thickened and overgrown. At this point, the problem won’t resolve on its own.
Signs of Infection
The jump from “irritated” to “infected” is the most important thing to watch for. An infected ingrown toenail will show several of these signs together:
- Warmth. The skin around the nail feels warmer than the surrounding toe when you touch it.
- Increasing redness or color change. The redness spreads beyond just the nail edge and starts reaching across more of the toe.
- Discharge or pus. Any fluid leaking from the nail border, especially if it’s cloudy, yellow, or has an odor.
- Pain without pressure. The toe hurts at rest, not just when you bump it or put on a shoe.
If you see red streaks extending away from the toe, or if you develop a fever, the infection may be spreading and needs prompt medical attention.
Conditions That Look Similar
A few other nail problems can mimic an ingrown toenail, and it’s worth ruling them out. Paronychia is an infection of the skin around the nail that causes similar redness and tenderness, but it’s typically triggered by bacteria or yeast getting into a break in the skin rather than the nail physically digging in. Paronychia often produces pus-filled blisters near the cuticle and is more common in people whose hands or feet spend a lot of time in water.
If the nail itself is lifting away from the nail bed and changing color to yellow, green, or white, that’s a different condition entirely, one where the nail plate separates and allows bacteria underneath. The key difference: an ingrown toenail pushes into the skin, while a lifting nail pulls away from it.
Why It Happened
Three causes account for most ingrown toenails. The first is trimming technique. Cutting your nails too short or rounding the corners instead of cutting straight across encourages the edge to grow into the skin as it lengthens. The second is footwear. Tight or narrow shoes, especially pointed-toe styles and high heels, compress the toes and force the nail edge into the surrounding skin over hours of wear. The third is trauma: stubbing your toe, dropping something on it, or repetitive pressure from running or kicking sports can damage the nail bed and alter how the nail grows back.
Some people are also simply predisposed. Naturally curved toenails are more likely to dig into the skin regardless of how carefully you trim them or what shoes you wear.
Why Diabetes Changes the Equation
If you have diabetes, an ingrown toenail carries more risk than it does for most people. Nerve damage in the feet, a common complication of diabetes, can reduce sensation to the point where you don’t feel the nail digging in until an infection is well established. Reduced circulation in the extremities also slows healing, giving infections more time to take hold and spread.
In serious cases, an infected ingrown toenail can develop into an ulcer that’s slow to heal and difficult to manage. Without timely treatment, the infection can spread to surrounding tissue. This is why regular foot checks are essential if you have diabetes. Look for redness, swelling, or any changes in the skin around your nails, even if you don’t feel pain there.
When Home Care Isn’t Enough
If you’re in that first stage, with mild tenderness and slight swelling, soaking your foot in warm water for 15 to 20 minutes a few times a day and wearing roomier shoes can give the nail space to grow out naturally. Some people gently place a small piece of cotton or dental floss under the nail edge to encourage it to grow above the skin rather than into it.
If that approach hasn’t improved things after a few days, or if you’re seeing pus, significant swelling, or worsening pain, a healthcare provider can numb the toe and trim or remove the portion of nail that’s embedded in the skin. The procedure is quick, and the relief is usually immediate. For nails that keep growing back ingrown, a provider can treat the root of that section of nail so it doesn’t regrow in the same pattern.