If your cut looks infected, the most important first step is cleaning the wound thoroughly with clean running water, applying an antibiotic ointment, and covering it with a fresh bandage. A mild infection caught early can sometimes be managed at home, but most infected cuts benefit from a doctor’s evaluation, especially if symptoms are worsening or you develop a fever. Knowing exactly what to look for helps you decide how urgently you need care.
How to Tell if a Cut Is Infected
Not every red, sore cut is infected. Some redness and swelling in the first day or two is part of normal healing. Infection looks different: the redness spreads outward from the wound rather than shrinking, the area feels warm or hot to the touch, swelling increases instead of going down, and pain gets worse over time rather than better.
The clearest sign of infection is drainage. Infected wounds produce pus, a thick, milky fluid that can be white, yellow, green, pink, or brown. It typically smells bad. If the color or odor of that drainage changes, the infection is getting worse. A cut that was healing fine and then starts oozing or becomes more painful after the first 48 hours is a strong signal that bacteria have taken hold.
Immediate Steps You Can Take at Home
Start by washing your hands, then gently clean the wound with lukewarm water. Avoid hydrogen peroxide or rubbing alcohol directly in the cut, as these can damage the tissue trying to heal. If there’s dried drainage around the wound, soften it with a warm, wet cloth before gently wiping it away.
After cleaning, apply a thin layer of over-the-counter antibiotic ointment (the kind you’d find in any first aid aisle) and cover the cut with a clean bandage. Hydrocolloid bandages are a good option because they maintain a moist healing environment and draw fluid out of the wound. Medicated bandages with built-in antibiotic ointment are another convenient choice. Change the dressing at least once a day or whenever it gets wet or dirty.
Keep the wound elevated above your heart when possible, especially if it’s on a hand, arm, or leg. This helps reduce swelling. Monitor the wound closely over the next 24 hours. If symptoms improve, meaning less redness, reduced swelling, and decreasing pain, you may be on the right track. If they stay the same or worsen, it’s time to see a doctor.
When Home Care Isn’t Enough
Plenty of infected cuts need professional treatment. See a doctor if:
- Redness is expanding beyond a small ring around the wound
- Pus is increasing or changing color
- You develop a fever, even a low one
- The wound isn’t improving after 24 to 48 hours of home care
- The cut is deep, was caused by a dirty or rusty object, or involved an animal bite
A doctor will typically clean the wound more thoroughly than you can at home, sometimes reopening it to drain trapped pus. For mild to moderate infections, you’ll likely be prescribed oral antibiotics. The course usually lasts at least one week, and for uncomplicated skin infections, five days of treatment can be as effective as ten. You should start feeling improvement within a few days of starting antibiotics, but the wound itself may take weeks to fully close depending on the severity.
For very superficial infections, a prescription-strength antibiotic ointment applied for three to five days may be enough.
Red Flags That Need Urgent Care
Some signs mean the infection is spreading beyond the wound, and you should get medical help right away rather than waiting for a scheduled appointment.
Red streaks extending outward from the cut along your skin are a hallmark of lymphangitis, an infection of the lymphatic system. This moves fast. In less than 24 hours, an infection can spread from the original wound to several areas of your lymphatic system. Left untreated, it can enter your bloodstream and cause sepsis, a life-threatening emergency.
Other warning signs of a spreading infection include a fast heart rate, rapid breathing or shortness of breath, confusion, fever combined with chills, or feeling significantly worse overall. These symptoms suggest the infection is no longer localized to the cut and needs immediate treatment, often with stronger antibiotics given in a medical setting. Don’t wait to see if these symptoms pass on their own.
Tetanus and Dirty Wounds
If your cut came from a dirty object, a rusty nail, something contaminated with soil or animal waste, or any deep puncture wound, tetanus is a real concern. Whether you need a tetanus shot depends on your vaccination history.
You don’t need one if you’ve completed your full tetanus vaccine series and got your last booster less than five years ago. For clean, minor wounds, a booster is recommended if your last shot was ten or more years ago. For dirty or deep wounds, the threshold is tighter: a booster is recommended if it’s been five or more years. If you’re unsure of your vaccination history or never completed the primary series, you should get vaccinated regardless of the wound type.
What to Expect During Recovery
Once you’re on the right treatment, improvement usually starts within a few days. The redness should begin pulling back, pain should decrease, and drainage should slow. But full healing can take considerably longer. Depending on how deep the infection went and how much tissue was affected, it may take days, weeks, or even months for the wound to completely clear and close.
If you’re prescribed antibiotics, finish the entire course even if the cut looks better partway through. Stopping early is one of the most common reasons infections come back. Keep the wound clean and covered throughout recovery, and watch for any return of worsening symptoms. A cut that seemed to be healing and then flares up again may need a different antibiotic or further evaluation to make sure there isn’t a deeper pocket of infection that wasn’t fully drained.
Certain factors slow healing and raise infection risk: diabetes, a weakened immune system, poor circulation, and smoking all make it harder for your body to fight off bacteria and repair tissue. If any of these apply to you, err on the side of getting professional care sooner rather than later.