What to Do If a Bite Looks Infected

Last updated: 3 August 2025

Step 1: Know the Signs of Infection

Common signs that a bite is infected include:

  • Increasing redness or swelling around the bite area
  • Warmth to the touch
  • Pus or fluid leaking from the wound
  • Throbbing or worsening pain
  • Fever or chills
  • Swollen glands near the bite

If you notice one or more of these symptoms, it's important to act quickly. Infection can spread to surrounding tissue (cellulitis) or even into the bloodstream (sepsis) if left untreated.

Step 2: Clean the Bite Gently

If the wound is still open and not too severe, gently clean it with mild soap and warm water. Avoid using strong antiseptics like hydrogen peroxide or iodine, as these can damage tissue. Pat dry with a clean cloth and avoid covering the wound with dirty materials or tight dressings.

Step 3: Apply an Antiseptic and Monitor

Use an over-the-counter antiseptic cream or ointment to reduce the chance of further infection. Cover the bite with a clean plaster or bandage, and change it daily. Monitor the area closely over the next 24–48 hours.

Step 4: Don’t Squeeze or Scratch

Even if there’s visible pus, don’t try to squeeze it out. This can push bacteria deeper into the skin and make things worse. Avoid scratching as well, as this introduces more bacteria and irritates the wound.

Step 5: Seek Medical Help if It Worsens

You should contact your GP, call 111, or visit a walk-in clinic if:

  • The redness or swelling continues to spread
  • You develop a fever or feel unwell
  • There’s pus or discharge
  • The pain becomes worse instead of better
  • You were bitten by a human or an animal

You may need a prescription antibiotic to clear the infection. Doctors may also consider whether you need a tetanus booster or additional treatment depending on the source of the bite.

Step 6: Know When It's an Emergency

Go to A&E or call 999 immediately if you experience:

  • Red streaks spreading from the bite (a sign of sepsis)
  • Difficulty breathing or swallowing
  • Loss of consciousness or confusion
  • Rapid heartbeat or low blood pressure

These can be signs of a life-threatening infection and need urgent treatment.

Preventing Bite Infections

To reduce your risk of infection from future bites:

  • Clean all wounds thoroughly, even small ones
  • Use insect repellent to avoid bites outdoors
  • Avoid contact with stray or aggressive animals
  • Keep your tetanus vaccinations up to date

Frequently Asked Questions

Infection can develop within 24 to 72 hours after the bite. Early symptoms include redness and swelling, which may worsen if left untreated.
Not always. Mild infections may clear with proper cleaning and antiseptic care, but moderate to severe infections often require antibiotics.
Human and animal bites have a high risk of infection. Always seek medical advice, as antibiotics and tetanus shots are often recommended.