An infected ingrown toenail produces visible pus, increased swelling, and pain that worsens rather than stays the same. A non-infected ingrown nail hurts when you press on it and looks red, but once bacteria take hold, the symptoms escalate noticeably: the redness spreads, fluid starts draining from the skin beside the nail, and the pain becomes constant rather than pressure-dependent.
The Three Stages of Ingrown Toenails
Ingrown toenails progress through recognizable stages, and understanding where yours falls tells you whether infection has set in.
In the first stage, you’ll notice mild redness, slight swelling, and pain only when something presses against the toe. This is irritation, not infection. The nail edge is digging into the skin fold, but bacteria haven’t colonized the area yet. Many ingrown toenails stay at this stage and resolve on their own with proper care.
The second stage is where infection begins. Swelling increases significantly, and the skin next to the nail becomes warm and tender to the touch. The hallmark sign is discharge. You may notice fluid seeping from the nail fold that ranges from clear and slightly bloody (called seropurulent drainage) to thick, white, or yellow pus. The surrounding skin may start to break down into a small ulcer. Pain at this stage doesn’t require pressure to trigger it.
In the third stage, the infection has become chronic. The body starts building granulation tissue, which looks like small, red, raw bumps of flesh growing over or beside the nail. The skin fold itself thickens and enlarges visibly. Discharge continues, and the toe may have a noticeable odor. This stage won’t resolve without medical treatment.
What Infected Discharge Looks Like
The clearest sign of infection is what comes out of the wound. Normal irritation from an ingrown nail might produce a tiny amount of clear fluid or a small spot of blood. Infected tissue produces pus, a thick fluid that builds up under the skin beside the nail and can range from white to yellow to greenish. You may see a visible pus-filled pocket forming along the nail fold.
If the discharge has a foul smell, that’s another strong indicator of bacterial infection. The most common culprit is Staphylococcus aureus, the same bacteria responsible for many skin infections. Less frequently, Pseudomonas or Streptococcus species are involved. The specific bacteria don’t change what you see, but they do explain why an infected ingrown nail can escalate quickly if left alone.
Signs the Infection Is Spreading
Most infected ingrown toenails stay localized to the skin around the nail. But in some cases, the infection pushes deeper into surrounding tissue, a condition called cellulitis. The warning signs are hard to miss if you know what to look for:
- Expanding redness. The red area grows beyond the immediate nail fold and spreads across the toe or toward the foot.
- Red streaks. Lines of redness extending away from the toe toward your ankle indicate the infection is traveling along lymph channels.
- Fever or chills. Any systemic symptoms mean the infection is no longer just a local problem.
- Increasing warmth. The skin around and beyond the toe feels noticeably hot compared to your other foot.
An untreated spreading infection can lead to serious complications including bloodstream infection and, in rare cases, bone infection in the toe. Bone infection causes deep, persistent pain and fatigue that feels disproportionate to a “simple” toenail problem. If redness is expanding rapidly or you develop a fever, that warrants same-day medical attention.
Who Faces Higher Risk
If you have diabetes, even a mild ingrown toenail infection deserves prompt professional care. Diabetes reduces blood flow to the feet and impairs nerve sensation, which means you may not feel how bad the infection actually is. Small cuts and ulcers on diabetic feet can escalate to infections serious enough to threaten a limb. The American Diabetes Association specifically recommends trimming nails straight across and avoiding cutting into the corners to prevent ingrown nails in the first place.
People with peripheral artery disease, weakened immune systems, or conditions requiring immunosuppressive medications face similar risks. Reduced circulation means your body delivers fewer infection-fighting cells to the toe, allowing bacteria to gain ground faster than they would in a healthy foot.
What You Can Try at Home
If your ingrown toenail is at the first stage (red and sore but no pus or drainage), home care is reasonable. Mix one to two tablespoons of Epsom salts into a quart of warm water and soak your foot for 15 minutes. Repeat this several times a day for the first few days. After soaking, gently dry the toe and place a small piece of clean cotton or dental floss under the nail edge to encourage it to grow above the skin fold rather than into it. Wear open-toed shoes or loose footwear to reduce pressure on the nail.
Home soaks work best for irritation, not established infection. If you see pus, if the redness and swelling are getting worse rather than better after two to three days of soaking, or if the symptoms keep returning, home treatment has reached its limit.
What Happens at the Doctor’s Office
For a moderately infected ingrown nail, a doctor may prescribe oral antibiotics and, if a pus pocket has formed, drain it in the office. This provides immediate pressure relief and lets the antibiotics work more effectively.
For nails that are severely infected or keep coming back, the standard procedure is partial nail avulsion, where the doctor removes the strip of nail digging into the skin. This is done under local anesthesia and takes only a few minutes. On its own, simply removing the nail strip has a high recurrence rate (42 to 83 percent), because the nail root is still intact and grows back the same way.
To prevent recurrence, most doctors combine nail removal with a chemical treatment to the nail root using phenol. This destroys the portion of the root responsible for the problem edge, and it drops the recurrence rate dramatically, to somewhere between 1 and 10 percent. One study found a recurrence rate of just 3.3 percent at three months following this approach. Recovery involves keeping the toe clean and bandaged for a few weeks while the treated area heals.
You’ll typically walk out of the office the same day. The toe will be sore once the numbing wears off, but most people return to normal shoes within a week or two. The cosmetic result is a slightly narrower nail that most people barely notice.