If your cut looks infected, the first step is to clean it gently with clean running water, apply an over-the-counter antibiotic ointment, and cover it with a fresh bandage. A mild infection caught early can often be managed at home, but certain warning signs mean you need medical attention the same day. Knowing the difference matters because an untreated skin infection can spread quickly, sometimes within hours.
How to Tell if Your Cut Is Actually Infected
Not every red, sore cut is infected. Some redness and swelling in the first day or two is part of normal healing. An infection looks different: the redness spreads beyond the edges of the wound, the skin feels warm to the touch, and the area becomes increasingly painful rather than gradually improving. You may also notice swelling, pus or cloudy drainage, and a foul smell.
The key distinction is trajectory. A healing cut gets a little better each day. An infected cut gets worse. New or increasing pain after the first 48 hours, delayed healing beyond what you’d expect for a minor wound, and abnormal-looking tissue around the edges all point toward infection.
Cleaning the Wound at Home
Run clean tap water over the cut for several minutes. Potable tap water, sterile saline, and sterile water are all safe choices for wound irrigation because they don’t damage the cells your body needs to heal. If there’s visible dirt or debris, use a mild soap around the wound (not directly in it), then rinse thoroughly.
Skip the hydrogen peroxide and rubbing alcohol. Both are still sitting in many medicine cabinets, but research has shown that hydrogen peroxide has minimal ability to kill bacteria while being highly toxic to the very cells responsible for healing. Rubbing alcohol causes similar cell damage. These products can actually slow your recovery.
After cleaning, apply a thin layer of over-the-counter antibiotic ointment and cover the wound with a clean adhesive bandage or sterile gauze. Change the bandage at least once a day, or whenever it gets wet or dirty. Each time you change it, rinse the wound again with clean water and reapply ointment.
Signs You Need to See a Doctor
Some infected cuts need more than home care. See a healthcare provider promptly if:
- The redness is spreading. Infection that extends well beyond the wound edges suggests cellulitis, a deeper skin infection that requires prescription oral antibiotics, typically for at least five days.
- You see red streaks. Lines of redness radiating away from the wound toward your trunk are a sign of lymphangitis, meaning the infection is traveling through your lymphatic system. These streaks can spread remarkably fast, sometimes within hours.
- You develop a fever, chills, or body aches. Systemic symptoms mean the infection may be entering your bloodstream.
- There’s a soft, fluid-filled lump under the skin. A spongy, tender swelling near the wound suggests an abscess has formed. Abscesses typically need to be drained by a provider, not just treated with antibiotics.
- The wound isn’t improving after two to three days of home care. If you’ve been keeping it clean and it’s still getting worse, you likely need prescription treatment.
What Happens at a Medical Visit
For a straightforward skin infection without pus pockets, your provider will likely prescribe oral antibiotics. A standard course runs at least five days. You should start to see improvement within 48 hours of starting the medication. If things aren’t getting better by then, your provider may extend the course or switch to a different antibiotic.
If the infected area feels spongy or fluid-filled, your provider will check for an abscess. The treatment for an abscess is drainage: a small incision to let the infected fluid out. This is a quick in-office procedure. Antibiotics alone won’t resolve a walled-off pocket of infection because the medication can’t penetrate into it effectively.
For more serious infections with spreading redness, high fever, or red streaks, you may need intravenous antibiotics in a hospital or urgent care setting before switching to oral medication once the infection is under control.
Check Your Tetanus Status
An infected cut is a good reminder to check when you last had a tetanus shot. According to CDC guidance, if your wound was dirty (contaminated with soil, saliva, or rusty metal) and your last tetanus vaccination was five or more years ago, you need a booster. For clean, minor wounds, you’re covered as long as you’ve completed the primary vaccine series and your last shot was within the past five years. If you’re unsure of your vaccination history, let your provider know when you’re seen for the infection.
Helping the Wound Heal After Infection
Once the infection is under control, expect healing to take longer than it would have without the infection. Minor cuts normally heal in four to six weeks. An infected wound resets part of that clock because infection damages tissue and forces your body to fight bacteria before it can focus on repair.
Keep the area clean and moist with ointment and a bandage until the wound has fully closed. Moist wounds heal faster than dry ones. Avoid picking at scabs or crusts. If you’re on antibiotics, finish the entire course even if the wound looks better partway through, since stopping early allows surviving bacteria to rebound.
Watch the wound daily for any return of redness, warmth, or drainage. Reinfection is possible, especially if the original infection wasn’t fully cleared. A wound that repeatedly breaks down or fails to show steady progress over several weeks may need further evaluation.