An ingrown toenail develops when the corner or edge of your toenail grows down into the skin beside it, and the earliest sign is usually a focused tenderness along one side of the nail that hurts when you press on it or bump it against something. It most commonly affects the big toe, though any toenail can be involved. If the skin next to your nail looks puffy, feels sore to light touch, or appears redder (or darker) than your other toes, you’re likely dealing with an ingrown nail.
The First Signs You’ll Notice
In its mildest form, an ingrown toenail causes pain only when pressure is applied. You might feel it when you put on a snug shoe, stub your toe, or press on the skin alongside the nail. The skin on one or both sides of the nail will look slightly swollen and feel tender. At this point, the nail edge is just starting to dig in, and there’s no infection yet.
A helpful way to check: compare the affected toe to the same toe on your other foot. If one side of the nail bed looks puffier, redder, or more sensitive, that asymmetry is a strong clue. You may also notice that the skin along the nail edge seems to be creeping over the nail itself, rather than sitting flat beside it.
How Symptoms Progress
If the nail keeps pressing into the skin without being addressed, symptoms escalate in a fairly predictable pattern.
- Mild stage: Slight redness, minor swelling, and pain only with pressure. The skin looks irritated but intact.
- Moderate stage: Noticeable swelling, increased redness or darkening of the skin, and the beginning of discharge. Pain becomes more constant, not just when you press on it. You may see clear or yellowish fluid seeping from the nail edge.
- Severe stage: The skin beside the nail becomes overgrown, forming a raised, bumpy ridge of raw-looking tissue. Pus, significant swelling, and persistent pain are common at this point. The toe may feel warm or hot to the touch.
Most people catch it in the mild stage because the discomfort in a shoe is hard to ignore. The jump from mild to moderate can happen within a few days if tight footwear keeps compressing the toe.
Signs of Infection
Not every ingrown toenail gets infected, but when the nail punctures the skin, bacteria have an easy entry point. The signs that an infection has set in are distinct from ordinary irritation:
- Pus or cloudy drainage leaking from the side of the nail
- Worsening pain that throbs even at rest
- Warmth or heat radiating from the toe
- Spreading redness that extends beyond the immediate nail edge
If you have diabetes or any condition that affects blood flow to your feet, even a mild ingrown toenail warrants professional attention. The CDC specifically lists ingrown toenails as a reason for people with diabetes to visit their doctor or podiatrist, because reduced sensation and slower healing can let a minor issue become serious quickly.
What Causes Them in the First Place
The most common culprit is how you trim your nails. Cutting toenails in a curved shape, following the rounded contour of the toe, gives the nail edges more opportunity to grow downward into the skin. Cutting straight across keeps the nail growing forward as it should. Tearing or ripping nails instead of clipping them cleanly leaves jagged edges that can act like tiny spikes pushing into the surrounding skin as they grow out.
Footwear plays a major role too. Shoes with a narrow or pointed toe box cramp your toes together, pressing the skin against the nail edge for hours at a time. High heels are particularly problematic because they shift your body weight forward, driving your toes into the front of the shoe and intensifying pressure on the nails. Rigid, non-breathable materials make things worse by creating consistent pressure points and trapping moisture, which softens the skin and makes it easier for the nail to penetrate.
Teenagers and young adults are especially prone to ingrown toenails, partly because of increased sweating during physical activity. Excessive moisture softens the skin around the nail, making it more vulnerable. Genetics also matter: some people naturally have nails that curve more sharply at the edges, and thicker nails are harder to trim cleanly, which creates more chances for uneven edges.
Ingrown Toenail vs. Other Toe Problems
A few other conditions can mimic the pain of an ingrown toenail, so it helps to know what sets it apart. The defining feature is location: the pain and swelling sit right along the edge of the nail, where the nail meets the skin. If you gently pull the skin away from the nail border and feel relief, that’s a strong indicator.
A skin infection around the nail (called a paronychia) can look similar, with redness and pus near the cuticle or nail fold. The difference is that a paronychia typically involves the base or the sides of the nail without the nail itself physically digging into the tissue. With an ingrown toenail, you can often see or feel the nail edge embedded in swollen skin, or notice the skin growing over the nail corner.
A bruise under the nail from stubbing your toe will cause discoloration (dark red, purple, or black) beneath the nail plate itself, and the pain is usually centered under the nail rather than along its edge.
What You Can Do at Home
If you’ve caught it early, with mild swelling and pain only when pressed, home care often resolves it. Soak your foot in warm water for 15 to 20 minutes, two or three times a day. This softens the skin and reduces swelling. After soaking, gently try to lift the nail edge away from the skin using a clean piece of dental floss or a small wisp of cotton tucked under the corner. The goal is to encourage the nail to grow over the skin rather than into it.
Wear open-toed shoes or sandals whenever possible to take pressure off the toe. If you need closed shoes, choose ones with a wide, roomy toe box. Keep the area clean and dry between soaks.
If you see pus, increasing redness, or the pain is getting worse after two or three days of home care, the nail likely needs to be partially removed by a podiatrist. This is a quick in-office procedure done under local anesthesia. For nails that keep growing back ingrown, a small portion of the nail root can be treated so that the problematic edge doesn’t regrow.
Preventing Recurrence
Once you’ve had one ingrown toenail, your odds of getting another go up, especially if the underlying cause hasn’t changed. Trim your toenails straight across, leaving them roughly level with the tip of the toe. Avoid cutting them too short, which gives the skin a chance to fold over the nail as it regrows. Use sharp, clean nail clippers rather than tearing.
Choose shoes with enough room in the toe box that you can wiggle your toes freely. If you’re active or sweat heavily, change socks during the day and opt for moisture-wicking materials. For people whose nails naturally curve sharply, checking the nail edges every couple of weeks and gently filing down any sharp corners can keep a new ingrown nail from starting.