An ingrown toenail is infected when you see pus or discharge coming from the skin around the nail, the toe feels warm or hot to the touch, and the redness and swelling have gotten noticeably worse rather than better over a few days. A mild ingrown toenail causes some pain and redness on its own, so the key is recognizing when those symptoms cross the line from simple irritation into active infection.
Irritation vs. Infection: The Difference
Every ingrown toenail starts with inflammation. The nail edge presses into the surrounding skin, and your body responds with mild redness, swelling, and tenderness when you press on it. At this stage, there’s no infection. The toe hurts, especially in shoes, but the skin isn’t broken and nothing is draining from it. This is the point where home care (warm soaks, wearing open-toed shoes, gently lifting the nail edge) can still turn things around.
Infection happens when bacteria enter through the damaged skin. The symptoms shift in a noticeable way: the redness deepens and spreads beyond the immediate nail fold, swelling increases, and you start seeing liquid or pus draining from the area. The toe may feel warm or even hot compared to your other toes. Pain often changes character too. Instead of hurting mainly when you press on it or wear tight shoes, an infected ingrown toenail can throb at rest.
Five Signs That Point to Infection
- Pus or cloudy discharge. Any fluid draining from the skin next to your nail, whether white, yellow, or greenish, signals that bacteria are actively multiplying. Clear fluid alone can come from irritation, but anything cloudy or foul-smelling is infection.
- Increasing redness or skin darkening. On lighter skin, infection turns the area a deeper red. On darker skin tones, the area may look noticeably darker than the surrounding tissue. Either way, the discoloration spreads beyond where the nail meets the skin.
- Heat in the toe. Touch the affected toe, then touch the same toe on your other foot. If the sore one feels distinctly warmer, that’s your immune system fighting bacteria and driving blood flow to the area.
- Worsening swelling. Mild puffiness around an ingrown nail is normal. Swelling that makes the skin taut, shiny, or visibly larger than your other big toe suggests infection is building.
- Granulation tissue. This is a small, red, raw-looking bump of tissue (sometimes called “proud flesh”) that forms along the nail fold. It bleeds easily and often oozes. Granulation tissue signals a chronic, more advanced infection and won’t resolve on its own.
How Infected Ingrown Toenails Progress
Clinicians grade ingrown toenails in three stages, and understanding this progression helps you gauge where yours falls. Stage 1 is mild: some redness, minor swelling, pain with pressure. No infection yet. Stage 2 brings significant swelling, discharge, and local infection. This is where most people realize something has changed. Stage 3 involves granulation tissue forming alongside the nail, overgrowth of the skin fold around the nail, and ongoing pus drainage. At stage 3, the body is essentially stuck in an inflammatory loop it can’t resolve without intervention.
The shift from stage 1 to stage 2 can happen quickly, sometimes within days, especially if you’re picking at the area, wearing tight shoes, or walking barefoot in environments where bacteria thrive.
Warning Signs That Need Immediate Attention
Most infected ingrown toenails stay localized to the toe. But bacteria can spread, and certain red flags mean the infection is moving beyond the nail fold into deeper tissue. Watch for red streaks extending away from your toe along the top of your foot or toward your ankle. This pattern suggests the infection is tracking along your lymphatic vessels and can progress rapidly.
Fever and chills alongside a painful, swollen toe indicate your body is now fighting a systemic infection. A rapidly expanding area of redness, warmth, and swelling on the foot (cellulitis) also requires prompt care. Cellulitis spreads fast and needs treatment quickly to prevent it from reaching deeper structures.
In rare cases, prolonged untreated infection can reach the bone underneath the toe, a condition called osteomyelitis. Symptoms include deep, persistent pain, tiredness, and fever. Bone infections are serious but uncommon from ingrown toenails in otherwise healthy people.
Why Diabetes Changes the Equation
If you have diabetes, an infected ingrown toenail carries higher stakes. Nerve damage from elevated blood sugar can reduce sensation in your feet, meaning you might not feel the pain that normally alerts you to a worsening infection. Reduced blood flow to the feet, common in diabetes, slows healing and makes it easier for infections to take hold and spread. About 15% of people with diabetes develop a foot or toe ulcer at some point, and what starts as a minor ingrown nail infection can progress toward tissue death if circulation is poor enough.
People with diabetes, peripheral artery disease, or weakened immune systems should treat any sign of ingrown toenail infection as urgent rather than waiting to see if it improves. The margin for safe observation is much narrower.
What Treatment Looks Like
For a mildly infected ingrown toenail (stage 2 without spreading redness), warm soaks several times a day, keeping the area clean, and wearing roomy shoes may still help. But once infection is clearly present, most cases benefit from having the ingrown portion of the nail removed. This is a quick in-office procedure done under local anesthesia. The doctor numbs your toe, removes the offending nail edge, and in many cases treats the nail matrix so that strip of nail doesn’t grow back.
One finding that surprises many people: antibiotics generally aren’t needed. Research from the American Academy of Family Physicians shows that once the ingrown nail segment is removed, the infection and inflammation resolve on their own without antibiotics, with similar healing times. Oral antibiotics are only recommended when cellulitis, the spreading skin infection, is present. Neither oral nor topical antibiotics before or after the procedure improve outcomes in typical cases.
Recovery after a partial nail removal is straightforward. You’ll keep the toe bandaged and clean for a week or two. Most people can walk immediately, though the toe will be sore for a few days. The area usually heals fully within a few weeks.
Preventing Reinfection
Ingrown toenails recur frequently, especially on the big toe. Cut your toenails straight across rather than rounding the corners, which encourages the nail edge to dig into the skin as it grows. Keep nails at a moderate length rather than trimming them very short. Wear shoes with enough room in the toe box so there’s no pressure pushing the nail sideways into the skin. If you get ingrown toenails repeatedly, the procedure that destroys part of the nail root (matrixectomy) permanently narrows the nail and dramatically reduces recurrence.