A mildly infected cut can often be treated at home with proper cleaning, a protective covering, and close monitoring over a few days. But infections that spread, produce significant pus, or come with fever need professional medical care and likely a course of antibiotics. Knowing how to tell the difference is the first step.
How to Tell if Your Cut Is Infected
Not every red, sore cut is infected. Some redness and swelling around a fresh wound is a normal part of healing. Infection looks different: the redness expands outward from the wound edges rather than shrinking over time, the area feels warm or hot to the touch, and swelling increases instead of improving. You may also notice the wound getting deeper or larger rather than closing up.
The clearest signs of infection include pus or cloudy fluid draining from the wound, an unpleasant smell, and increasing pain days after the injury rather than decreasing pain. A helpful way to remember the warning signs: rising temperature (locally or body-wide), expanding redness, increasing drainage, and smell. If you’re seeing two or more of these, you’re likely dealing with an infected cut rather than normal healing irritation.
Clean the Wound Thoroughly
Start by washing your hands with soap and water. Then clean around the cut with a washcloth, mild soap, and warm water. After that, hold the wound under gentle, clear running warm water to flush out debris and bacteria. This irrigation step is more effective than dabbing at the wound with a cloth.
Skip the hydrogen peroxide and rubbing alcohol. Both irritate exposed tissue and actually slow healing. Plain water and mild soap are what emergency rooms and wound care clinics recommend. If the wound has visible dirt or debris embedded in it that you can’t rinse out, that’s a reason to have it looked at professionally.
Cover It and Keep It Moist
After cleaning, apply a thin layer of ointment and cover the wound with a clean bandage. Here’s something most people don’t realize: plain petroleum jelly works just as well as over-the-counter antibiotic ointments for healing minor wounds. A study published in the Journal of the American Academy of Dermatology found that a petrolatum-based ointment provided equivalent healing outcomes to a bacitracin and polymyxin B antibiotic ointment. The antibiotic version actually caused slightly more burning sensation in the first week.
That said, if your cut is showing early signs of infection (mild redness spreading, some tenderness), an OTC antibiotic ointment is reasonable to try for a day or two. The main goal of any ointment is keeping the wound moist. Dry wounds heal more slowly because new tissue needs moisture to grow. A covered, moist wound closes faster than one left open to air.
How often you change the bandage depends on drainage. A cut that’s barely weeping can stay covered for a couple of days with a film-type or hydrocolloid bandage. If the wound is producing moderate drainage, change the dressing every one to three days using an absorbent bandage. An actively infected wound with significant drainage needs daily or even twice-daily bandage changes. Regardless of timing, replace the bandage immediately if it gets wet, dirty, or starts to peel off.
When Home Care Isn’t Enough
A mild infection caught early can sometimes resolve with diligent cleaning and wound care at home. But certain signs mean the infection has progressed beyond what soap, water, and OTC ointment can handle:
- Red streaks extending outward from the wound toward your heart
- Expanding redness that spreads noticeably over hours rather than days
- Fever or chills alongside the wound symptoms
- A pocket of pus forming under the skin (abscess)
- Increasing pain that’s getting worse three or more days after the injury
Red streaks are particularly important. They indicate the infection is traveling along your lymphatic system, and that needs prompt medical attention.
What Happens at the Doctor’s Office
For a straightforward skin infection like cellulitis, where the skin around the cut is red, warm, and spreading, oral antibiotics for 5 to 10 days are the standard treatment. The specific antibiotic depends on what bacteria your doctor suspects. Common skin bacteria respond well to standard antibiotics, with success rates around 96% for typical cellulitis.
If the infection has formed an abscess (a raised, painful pocket of pus deeper in the tissue), it often needs to be drained. Sometimes drainage alone is enough. Other times, drainage plus antibiotics. Your doctor may take a culture of the fluid to identify the exact bacteria, especially if the infection comes back or doesn’t respond to initial treatment.
For infections caused by antibiotic-resistant bacteria like MRSA, different antibiotics are needed. Your doctor will choose the right one based on culture results and local resistance patterns. This is one reason it’s worth going in rather than hoping an infection will clear on its own: the wrong approach gives resistant bacteria time to dig in.
Check Your Tetanus Status
An infected cut is a good reminder to think about your tetanus vaccination. The CDC categorizes wounds by risk level. Cuts contaminated with dirt, soil, or saliva, as well as puncture wounds, crush injuries, and burns, are considered “dirty or major wounds” for tetanus purposes.
If you’ve completed your tetanus vaccine series and your last booster was less than five years ago, you don’t need another shot regardless of wound type. For dirty wounds, a booster is recommended if your last tetanus shot was five or more years ago. For clean, minor wounds, the threshold is 10 years. If you’ve never been vaccinated, have an incomplete series, or simply don’t know your vaccination history, you need a tetanus shot for any wound type.
Signs of a Dangerous Infection
Rarely, a wound infection can enter the bloodstream and cause sepsis, a life-threatening emergency. The early warning signs include a fast heart rate, confusion, and rapid breathing. Other symptoms of sepsis include very low blood pressure, fever or abnormally low body temperature, shaking or chills, extreme weakness, and skin that looks clammy or discolored. Some people develop a rash with small, dark-red spots.
Sepsis progresses quickly. If someone with an infected wound develops confusion, can’t catch their breath, or has a racing pulse along with fever, that’s an emergency room situation, not a wait-and-see situation. These symptoms can escalate within hours.