What should you know about cellulitis after an insect bite?

A bite can cause a small itchy area soon after contact. Cellulitis is different: the skin becomes increasingly warm, red, swollen, tender, or painful, and the affected area may expand. Scratching can break the skin and give bacteria an entry point. The bite itself does not prove that cellulitis is present; a clinician assesses the pattern and progression. Mark the edge of redness with a pen and note the time so changes are easier to describe.

Wash the area gently, pat it dry, and keep fingernails short. Contact a healthcare professional promptly if redness is spreading, pain is increasing, or swelling is becoming more pronounced. Do not scratch, squeeze, or apply harsh antiseptics. If antibiotics are prescribed, take them exactly as directed. Tell the clinician about allergies, diabetes, immune problems, and any new medicines. A cool compress may ease itch from a simple bite, but it does not treat cellulitis.

Get urgent help for rapidly expanding redness, severe pain, pus, red streaks, fever, chills, dizziness, confusion, or breathing difficulty. Feeling very unwell with a skin infection can indicate sepsis. Do not wait for the bite mark to disappear if the surrounding skin is worsening. Facial or eye-area swelling, or swelling affecting the mouth or throat, needs urgent assessment.

Ask whether the changes fit cellulitis or a local bite reaction, whether treatment is needed, how to monitor the border of redness, and which symptoms require emergency care. Ask how to protect the area from further scratching while it heals.