Anaphylaxis after a mosquito bite

Redness, itching and swelling around a bite are local reactions. Anaphylaxis after an insect exposure can present with throat or tongue swelling, breathing difficulty, wheezing, collapse, severe dizziness, or rapidly developing symptoms in several body systems.

A large local reaction may spread around the nearby limb and remain uncomfortable for days without affecting breathing or circulation. Its size alone does not establish anaphylaxis. Scratching can damage the skin, while increasing pain, warmth, pus or fever may point to infection rather than allergy.

A clinician will want to know how quickly symptoms began, whether they appeared away from the bite, and whether there was airway, breathing or circulation involvement. Identifying the insect can be difficult, so photographs and a clear timeline are more useful than guessing.

For a local reaction, wash the area, use a cool compress, avoid scratching and seek pharmacy or clinical advice about suitable itch relief. Avoid applying unverified herbal mixtures or essential oils to broken skin because they can irritate it or cause another reaction.

After a systemic reaction, arrange allergy follow-up. Discuss whether you need prescribed adrenaline, device training and a written action plan. Reduce future bites with covering clothing, screens and a repellent that is suitable for your age, health and pregnancy status.

Call emergency services for difficulty breathing, throat tightness, tongue swelling, a hoarse voice, collapse, confusion or severe faintness after an insect bite. If prescribed adrenaline for anaphylaxis, use it immediately according to the action plan and do not wait to see whether an antihistamine works.

Remain with the affected person, place them flat unless breathing difficulty requires supported sitting, and avoid sudden standing. Emergency assessment remains necessary if the symptoms settle after adrenaline.

Describe the bite location, symptom sequence and any treatment given. Ask whether the pattern was local or systemic, whether infection needs consideration, what bite prevention is suitable, and exactly when prescribed adrenaline should be used. Bring any photographs and the emergency record.