Overview
A bite reaction is the immune system responding to injected saliva or venom. This produces a localised itchy swelling that peaks within 48 hours and fades over several days.
Some people develop exaggerated local reactions (large, hot, swollen areas) or papular urticaria with recurrent itchy bumps. Bites can also become secondarily infected with skin bacteria, especially when scratched.
When to seek urgent medical help
- • Difficulty breathing, throat swelling, dizziness or widespread rash - call emergency services
- • Spreading redness with fever, pus or increasing pain
- • A spreading bullseye rash after a tick bite (possible Lyme disease)
Symptoms and signs
- Itchy red or dark bump appearing within hours of a bite
- Central puncture point with surrounding swelling
- Clusters or lines of bites, often on exposed skin
- Blistering at the bite site in strong reactions
- Spreading warmth, redness and tenderness suggesting infection
- Expanding circular rash days to weeks after a tick bite
Management and treatment
Simple bites need cool compresses, antihistamines and a topical steroid to reduce itch and swelling. Strong local reactions may need a more potent steroid, and infected bites need antibiotics started promptly.
Your ChatDoc doctor reviews your photos to distinguish an inflammatory reaction from cellulitis and prescribes exactly what is needed, including tick bite advice where relevant.
Prescription treatment options
Topical corticosteroid
Reduces itch and swelling in exaggerated local bite reactions.
Oral antihistamines
Non-sedating by day and sedating at night to control itch and improve sleep.
Oral antibiotics
Prescribed promptly when a bite becomes infected or cellulitis is developing.
Prevention plan
Repellents, bed linen and household treatment advice for recurrent or clustered bites.
Any prescription is issued only after a doctor has reviewed your case and considers the treatment safe and appropriate for you.
Your online Insect Bites assessment
- 1
Tell us about your concern
Share symptoms, past treatments, medicines and relevant health information.
- 2
Upload clear photos
Upload photos of your concern where applicable.
- 3
Doctor reviews your case
Technology helps organise your answers, but every assessment and prescription decision is made by a doctor, who may message you if they need more information.
- 4
Get your personalised plan
A personalised prescription is issued if treatment is clinically appropriate.
Prognosis and outlook
Uncomplicated bites settle within 3-7 days. Exaggerated reactions may take up to two weeks, and infected bites improve within 48-72 hours of starting antibiotics.
Dark marks can persist for several weeks after the swelling has settled, particularly in darker skin tones, and fade gradually with sun protection.
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This page is general medical information and does not replace a personal consultation. Always seek urgent care for severe or rapidly worsening symptoms. ChatDoc is not an emergency service. Call 999 (UK) or 112 (EU) for life-threatening emergencies or 111 for urgent non-emergency help. Do not wait for an online reply.