What Does an Ingrown Toenail Look Like, Stage by Stage

An ingrown toenail progresses through three recognizable stages, each with distinct visual and physical signs. In stage one, the skin alongside the nail turns pink or red and feels tender and slightly swollen; in stage two, the redness deepens, the swelling worsens, and you start to see pus or watery discharge oozing from the nail fold; in stage three, the tissue alongside the nail becomes chronically inflamed and produces a mound of raw, beefy-red granulation tissue that bleeds easily. What matters for you is recognizing which stage you’re in, because that determines whether you can manage things at home or need professional help.

How an Ingrown Toenail Actually Forms

An ingrown toenail happens when the edge or corner of the nail plate digs into the soft skin that surrounds it, triggering a cycle of pain, inflammation, and sometimes infection.¹ The big toe is by far the most common site. The process usually starts when a sharp edge or small spike of nail, sometimes invisible to the naked eye, anchors itself into the flesh of the nail fold. As the nail keeps growing forward, that spike drives deeper, much like a splinter burrowing further into skin with every step you take.

Several things set this process in motion. Improper nail trimming is the classic culprit: when you round off the corners of a toenail instead of cutting straight across, you can inadvertently create tiny barbs or spicules that hook into the surrounding tissue.² Tight shoes compress the toes together, pushing the skin into the nail’s edge or forcing the nail to curve as it grows. Trauma, sweating, fungal nail infections, and obesity are other recognized contributors, and in most cases several of these factors pile up at once rather than a single cause acting alone.²

The body’s response to the embedded nail edge is what produces the visible changes you see at each stage. Your immune system treats the intruding nail like a foreign body and sends inflammatory cells to the area, which is why even a mild ingrown toenail hurts out of proportion to what you’d expect from such a small patch of skin.

Stage 1: Redness, Swelling, and Tenderness

In stage one you feel it before you see much. The skin on one or both sides of the toenail becomes tender when you press on it or when your shoe presses against it for you. Visually, the nail fold, that ridge of skin running along the edge of the nail, looks slightly puffy and pink to reddish compared with the same spot on your other toes. The area is swollen and erythematous (meaning a flushed red) but there’s no drainage and no break in the skin.³

At this point the nail edge is irritating the skin but hasn’t yet punctured through it deeply enough to invite bacteria in. The swelling can make the nail fold bulge slightly over the edge of the nail, which makes it harder to see the actual corner of the nail and harder to trim properly. That’s the trap: the early swelling hides the problem and makes the natural instinct, digging at the corner with clippers, more likely to make things worse.

Stage one is the window where home care has the best chance of resolving the problem. Soaking the foot in warm water to soften the skin, gently lifting the nail edge if possible, wearing roomier shoes, and letting the nail grow out past the skin fold are standard approaches. If you catch things at this point, you can usually avoid the messier stages that follow.

Stage 2: Infection, Drainage, and Ulceration

Stage two marks the shift from irritation to active infection. The redness becomes angrier and more intense, the swelling gets noticeably worse, and you start to see fluid coming from the nail fold. This drainage is described clinically as seropurulent, a mix of clear serum and pus that ranges from yellowish to whitish-green. The skin alongside the nail may ulcerate, meaning a small raw area or open sore forms where the nail edge has broken through the tissue.³

The pain at this stage is harder to ignore. It often throbs even when you’re not walking, and the lightest touch, a bedsheet brushing against the toe at night, can be enough to wake you up. The toe may feel warm to the touch compared with the surrounding skin, and you might notice a faintly unpleasant smell from the discharge.

What’s happening under the surface is a bacterial invasion. Bacteria, commonly Staphylococcus aureus and other skin flora, have entered through the break in the skin created by the nail spike. Your body responds with a more aggressive inflammatory reaction, flooding the area with white blood cells. The pus you see is the debris from that battle. At this stage, home soaks and better trimming alone are usually not enough. Most clinicians recommend seeing a healthcare provider once pus or ulceration appears, because the infection needs to be addressed alongside the mechanical problem of the embedded nail.

Stage 3: Granulation Tissue and Chronic Inflammation

If stage two goes untreated or keeps recurring, the toe enters stage three: chronic infection with overgrowth of tissue. The hallmark visual sign is hypertrophic granulation tissue, a mound of moist, red, bumpy flesh that grows over and around the nail edge. This tissue is sometimes described as looking like raw hamburger or a small berry, and it bleeds easily when touched or bumped. The swelling is substantial, secretion is ongoing, and the nail may be partially buried under the overgrown skin.³

Granulation tissue is the body’s attempt to heal an open wound. When an ingrown nail keeps re-injuring the same spot with every millimeter of growth, the wound never closes cleanly; instead the tissue overproduces new blood vessels and connective tissue in a disorganized mound. The result looks alarming, and people often worry it might be cancerous. While it’s not malignant, it’s a clear signal that the body can’t resolve the problem on its own and that surgery is usually needed.

Conservative treatments can relieve early-stage symptoms, but surgical intervention is generally reserved for these severe or recurrent cases.⁴ The choice of procedure depends on how severe the ingrowth is and whether you’ve had it before. Common options include partial nail avulsion, where the offending strip of nail is removed, often combined with a chemical or surgical treatment to the nail matrix so that strip doesn’t grow back. In some cases, the excess soft tissue itself needs to be removed to decompress the nail.⁵

What Happens If You Ignore Stage 3

Most ingrown toenails, even unpleasant-looking stage-three cases, resolve once the offending nail edge is removed. But leaving a chronically infected ingrown toenail alone for weeks or months raises the risk of deeper complications. In children with prolonged infections, one study found that about a third of chronically infected ingrown toenails showed radiologic changes in the bone of the toe tip, mainly surface-level bone reactions rather than full-blown bone infection. True osteomyelitis as a complication was rare, but the children whose X-rays showed bone changes had been dealing with infections for roughly twice as long on average as those without such changes.⁶

In people with diabetes or peripheral vascular disease, even a minor nail-fold infection can spiral into cellulitis or a deeper soft-tissue infection because blood flow and immune response are compromised. This is why guidelines for diabetic foot care single out ingrown toenails as something that needs professional attention early rather than a wait-and-see approach.

Why Both Sides Can Look Different

You might notice that one side of the nail looks worse than the other, or that the ingrowth is only on one side. That’s completely normal. Most ingrown toenails affect one lateral nail fold, not both, because the spike or curve that started the problem usually originates from one corner. The unaffected side of the same toe can look perfectly healthy, which sometimes makes people doubt they actually have an ingrown nail since half the toe looks fine.

Occasionally both sides are involved, especially when the root cause is a nail that is naturally very curved. A condition called pincer nail, where the nail progressively curves inward from both edges, squeezing the nail bed beneath it, can cause bilateral ingrowth. Pincer nails most commonly affect both big toenails and tend to worsen over time.⁷ The visual appearance is distinctive: the nail looks like it’s rolling inward from the sides, sometimes forming an almost tubular shape. If you press on the center of the nail and the edges visibly dig into the skin on both sides, a pincer nail might be involved rather than a simple ingrown toenail from bad trimming.

Conditions That Mimic an Ingrown Toenail

Not every painful, swollen toe is an ingrown nail. A few conditions produce similar-looking inflammation around the nail, and telling them apart matters because the treatments differ.

Retronychia is one lesser-known mimic. Instead of the nail growing into the side fold, in retronychia the nail plate embeds backward into the fold at the base of the nail (the cuticle end). Multiple generations of nail can stack up beneath the proximal nail fold, causing chronic swelling and redness that looks a lot like a nail infection. Because retronychia mimics other nail disorders with chronic inflammation around the cuticle, it’s often misdiagnosed.⁸ The key visual clue is location: if the inflammation and thickening are concentrated at the base of the nail rather than along the sides, retronychia should be considered.

Subungual exostosis is another look-alike. This is a bony growth beneath or beside the nail that pushes the nail up or to the side, sometimes causing the same lateral wall thickening you’d see with an ingrown nail. In a series of three patients, two presented with the classic firm bump poking out from under the nail edge, while a child had bilateral nail distortion with thickened lateral walls that could easily be mistaken for bilateral ingrown toenails.⁹ An X-ray can usually distinguish exostosis from a straightforward ingrown nail.

Paronychia, a bacterial or fungal infection of the nail fold, can also look similar. The difference is subtle: in paronychia the infection originates in the skin fold itself (from a hangnail, a cuticle tear, or chronic moisture), while in an ingrown toenail the nail edge is the primary offender. Both produce redness, swelling, and pus, but pressing on the nail fold in paronychia won’t reveal a buried nail edge underneath. If you’ve been treated for an “ingrown toenail” repeatedly and it keeps coming back despite nail removal, one of these mimics might be the actual culprit.

What Trimming Mistakes Look Like Up Close

Understanding how improper trimming sets the stage helps explain what you’re seeing when an ingrown nail develops. When you try to round off the corner of a toenail, your clippers can leave a tiny barb or spike that’s invisible to the naked eye but sharp enough to catch on the soft tissue of the nail groove. As the nail grows, that spike acts like a fishhook anchored into the fold, driven deeper with each step.²

Cutting the nail too short compounds the problem. When the nail is trimmed below the tip of the toe, the pressure from walking compresses the distal nail bed, causing it to shrink slightly. As the nail regrows, it now has to push through a tighter channel, and any small spicule is more likely to snag. This is why the advice to trim straight across and leave the nail long enough to reach the tip of the toe isn’t just cosmetic fussiness: it directly reduces the chance of a spicule embedding itself.

Tight or narrow footwear adds external pressure that pushes the skin fold into the nail edge, or forces the nail to grow with a greater curve. The combination of shoe compression, micro-trauma from walking, and the body weight bearing down on a particular region of the foot all play a role.² If you’ve ever noticed that your ingrown toenail flares up after wearing a particular pair of shoes for a long day, that’s not coincidence.

After Treatment: What the Healing Toe Looks Like

If you’ve had a partial nail avulsion or other surgical procedure, the toe’s appearance in the weeks afterward can be unsettling if you don’t know what to expect. Immediately after, the area where the nail strip was removed looks like a raw, reddish groove alongside the remaining nail. There’s usually some oozing of clear or blood-tinged fluid for the first few days. The surrounding skin stays puffy and tender for a week or two.

Over the following weeks, the groove fills in with new skin and the redness gradually fades. If a chemical matrixectomy was performed (commonly using phenol to destroy the nail root on that side), the healing area may look whitish-gray initially from the chemical burn, then transition to pink as healthy tissue replaces it. The nail itself will be narrower than before because the strip that was causing the problem is gone for good.

One thing to watch for after surgery is ectopic nail formation. If the nail matrix wasn’t fully treated during the procedure, a small remnant can produce a spicule of nail that grows irregularly, sometimes poking up through the skin at an odd angle rather than following the normal nail bed.¹⁰ If you see a hard, sharp fragment poking through healed skin weeks or months after a procedure, that’s likely a regrown nail spicule and it’s worth having a provider look at it before it triggers another round of inflammation. Recurrence rates vary by technique, but the possibility of regrowth is the main reason follow-up matters even after the toe feels fine.