If you think a wound is infected, the first step is to assess how serious it looks, clean it gently with plain water or saline, and get medical attention if the infection has spread beyond the wound’s edges. Most mild surface infections can be managed with topical treatments, but anything deeper or more widespread typically needs prescription antibiotics. Acting quickly matters because wound infections can escalate within hours.
How to Tell If a Wound Is Infected
Normal healing involves some redness and swelling in the first few days, but infection looks different. The key signs are thick, cloudy, white or cream-colored discharge from the wound, redness that extends beyond the wound’s edge, and skin around the wound that feels warm or hot to the touch. Pain that gets worse instead of better over time is another strong signal, along with increasing swelling or tenderness.
A fever above 101°F (38.4°C) suggests the infection may be affecting your whole body, not just the wound. If redness around the wound extends less than 2 cm (roughly the width of a penny), the infection is generally considered mild. Once that redness stretches beyond 2 cm, or the infection involves deeper tissue, it’s classified as moderate and needs more aggressive treatment.
What to Do Right Away
Start by cleaning the wound with clean running water, sterile saline, or even clean drinking water. Use gentle pressure to flush out debris. Don’t scrub hard or use high-pressure tools on the wound because crushing or forcing tissue can make things worse. If the wound is actively bleeding, don’t irrigate it. Stop the bleeding first with gentle pressure.
After cleaning, cover the wound with a nonstick dressing that keeps the area moist. Dry wounds heal more slowly, and a dressing that sticks to the wound will tear away new healing tissue when you remove it. If a dressing does stick, soak it with water or saline for several minutes before gently pulling it off. Layer an absorbent pad over the nonstick dressing if the wound is producing a lot of fluid, then cover the whole thing with a waterproof outer layer.
Skip the Hydrogen Peroxide
Hydrogen peroxide is one of the most common things people reach for, but it does more harm than good. While it does kill germs, it also destroys the healthy tissue your body is trying to use to close the wound. This can actually make the wound larger and slower to heal. The damage is even worse for people with diabetes or weakened immune systems, whose bodies already struggle to regenerate tissue. Plain water or saline is safer and effective for cleaning.
When You Need Medical Help
A mild surface infection, like a small area of redness around a scrape, can often be treated at home with over-the-counter antibiotic ointments. But several situations call for a doctor’s evaluation:
- Spreading redness: If the red area around the wound extends 2 cm or more, you likely need oral antibiotics rather than a topical cream.
- Red streaks: Lines of redness radiating outward from a wound indicate the infection has reached your lymphatic system. This is called lymphangitis, and it can spread from the wound to multiple areas of your body in less than 24 hours. Seek care immediately.
- Fever, chills, or flu-like symptoms: These suggest the infection is becoming systemic. A heart rate above 90 beats per minute, rapid breathing, or confusion alongside an infected wound are signs of a serious, potentially life-threatening reaction.
- Deep tissue involvement: If you see signs of an abscess (a painful, swollen pocket of pus), or the wound involves muscle, tendon, or bone, this goes beyond what home care can handle.
- No improvement after a few days: If the wound isn’t showing signs of closing after a day, or hasn’t healed within a month, it’s considered a chronic wound that needs professional evaluation.
How Doctors Treat Infected Wounds
Your doctor’s approach depends on the infection’s severity. Mild surface infections, like a shallow cut with some surrounding redness, are usually treated with topical antibiotic creams. If there’s concern about drug-resistant staph (MRSA), a specific ointment called mupirocin works better than other topical options and even some oral antibiotics.
For infections that go deeper than the skin surface or involve more than 2 cm of surrounding redness, oral antibiotics are the standard treatment. Severe infections, those accompanied by fever, rapid heart rate, low blood pressure, or confusion, often require intravenous antibiotics in a hospital.
Your doctor may also take a wound culture, either by swabbing an open wound or using a needle to sample fluid from an abscess. This identifies exactly which bacteria are causing the infection and which antibiotics will work against them. Staph and strep bacteria are the most common culprits in wound infections, but a range of other bacteria can be involved, especially in wounds contaminated with soil, feces, or saliva.
Don’t Forget About Tetanus
An infected wound is a good time to think about your tetanus vaccination status. CDC guidelines recommend a tetanus booster for dirty or major wounds (those involving dirt, soil, animal bites, punctures, burns, or dead tissue) if your last tetanus shot was five or more years ago. For clean, minor wounds, the threshold is ten years. If you’ve never completed the full tetanus vaccine series, or you’re unsure of your vaccination history, you need a shot regardless of wound type.
Higher Risk If You Have Diabetes
People with diabetes face a uniquely dangerous situation with wound infections, particularly on the feet. Nerve damage from diabetes can mask pain and inflammation, meaning a foot infection may be well advanced before you even notice it. Poor circulation in the lower legs also makes it harder for your body to fight infection and heal the wound.
The combination of infection and poor blood flow dramatically increases the risk of complications, including amputation. Guidelines from the Infectious Diseases Society of America recommend that anyone with diabetes and a moderate to severe foot infection be evaluated by an infectious disease specialist within 24 hours. If there’s significant pus buildup, dead tissue, or signs of a deep abscess, surgical drainage is often needed within 24 to 48 hours. Even moderate foot infections in people with diabetes may warrant hospitalization.
If you have diabetes and notice any sign of infection in a foot wound, no matter how minor it seems, contact your doctor the same day. The usual “wait and see” approach that works for healthy individuals is not safe here.