Do insect bites and stings cause facial swelling?

Swelling can develop near the bite or sting as the immune system reacts to saliva or venom. It may affect an eyelid, cheek, lip, or another nearby area and can come with itching, redness, warmth, or tenderness. A broader reaction can cause swelling in areas away from the original site. Facial swelling has other possible causes too, so its pattern and accompanying symptoms matter. A clinician may ask what happened, how quickly symptoms appeared, and whether you have reacted before.

Move away from the insect and gently wash the area. A wrapped cool pack may ease discomfort, and avoid scratching. If a stinger is visible, remove it carefully without squeezing the venom sac. Follow advice from a pharmacist or clinician about an antihistamine. Watch symptoms closely, particularly when the bite or sting is near the mouth or eye. Do not delay urgent care while trying home treatment if breathing or swallowing changes.

Call emergency services immediately for swelling of the tongue or throat, wheezing, trouble breathing, difficulty swallowing, widespread hives, dizziness, faintness, or sudden weakness. Use a prescribed adrenaline auto-injector if your emergency plan tells you to, then seek emergency help. Arrange medical advice for spreading redness, worsening pain, pus, fever, or swelling that does not settle.

Ask whether the reaction fits a local allergy, infection, or another cause; which medicine is suitable; and whether you need an allergy action plan. Ask what to do if another bite or sting causes mouth, face, or throat swelling.