Skeeter Syndrome: When a Mosquito Bite Is More Than Just An Itch

Bites to the cheek or forehead can often result in swelling of the entire side of the face, including eyelids.

Summer means sunshine, splash parks...and mosquitoes. Most mosquito bites are nothing more than a small, itchy nuisance. But some children, particularly infants and toddlers, develop an unusually dramatic reaction that can be alarming for parents. This is known as skeeter syndrome.

The good news? While it can look dramatic, it is not dangerous and almost always gets better with time.

What is Skeeter syndrome?

Skeeter syndrome is a large localized reaction to a mosquito bite. Instead of a small bump, children develop significant redness, warmth, swelling, and itching around the bite several hours after they are bitten. Some children can develop blisters, a low-grade transient fever, swollen lymph nodes, and fussiness along with the above symptoms. The swelling can become several centimetres across and may continue to enlarge over the first 24-48 hours before getting better on their own.

Young children are affected most commonly because their immune systems are still developing. Some children are also simply more prone to mosquito bite reactions than others.

What does it look like?

• A very large area of swelling around a mosquito bite

• Redness and warmth

• Occasionally, small blisters in the centre of the bite

• The swelling can be especially dramatic around the eyelids, lips, hands, or feet,

Is it an infection?

This is where many parents (and sometimes even healthcare providers) get confused.

Skeeter syndrome can look very similar to cellulitis, a bacterial skin infection. The biggest clue is timing.

Skeeter syndrome

• Appears within hours of the mosquito bite (including the low-grade fever, if present)

• Is very itchy

• Usually worsens over the first 24-48 hrs and then gradually improves

Cellulitis (bacterial skin infection)

• Usually develops more gradually several days after the bite appears, with redness and swelling that continues to worsen rather than improve

• Is often increasingly painful rather than itchy

• May be associated with fever or feeling unwell several days after the bite appears

  
  

Sometimes it can be difficult to tell the difference, so it's always reasonable to have your child assessed if you're unsure.

Is it an allergic reaction?

Skeeter syndrome is a large local allergic reaction to proteins in mosquito saliva. In fact, everyone has some degree of allergic response to these proteins—that's why mosquito bites are itchy. Children with skeeter syndrome simply have a much stronger local reaction, resulting in the dramatic appearance and intense itch.

The good news is that having Skeeter syndrome does not lead to anaphylaxis and does not mean your child is likely to develop a life-threatening allergy to mosquito bites (anaphylaxis from a mosquito bite is extremely rare). Nor does it mean they will react more strongly the next time they are bitten. While some children do tend to suffer from recurrent skeeter syndrome, most children grow out of it. As children get older and are exposed to more mosquito bites, their immune systems often become less reactive, and these exaggerated local reactions usually become milder over time.

How can I treat it?

• Most reactions gradually settle on their own 3-7 days after the bite first appears

• Treatment focuses on reducing the itch:

✔ Apply a cool compress or ice pack (wrapped in a cloth) for 10-15 minutes at a time

✔ Encourage your child not to scratch, as this increases the risk of secondary infection

✔ A 1% hydrocortisone cream may help reduce itching and inflammation

✔ A non-drowsy oral antihistamine can also help with intense itching that is not

responding to topical measures, particularly if started early after the bite (see my post on which oral antihistamine to choose)

When should I seek medical care?

• The swelling continues to worsen after the first couple of days.

• Your child develops a high fever or appears very ill.

• There is increasing pain, pus, or spreading redness that raises concern for a bacterial infection.

• The swelling interferes with vision or normal movement.

  
  

Call 911 immediately if your child develops difficulty breathing, swelling of the tongue or throat, repeated vomiting, dizziness, or appears faint after a mosquito bite (anaphylaxis from a mosquito bite is extremely rare!)

Preventing Mosquito Bites: Bug Spray & More

• Dress children in long sleeves and pants when mosquitoes are active.

• Avoid standing water around your home.

• Limit outdoor play at dawn and dusk when mosquitoes are most active.

• The Canadian Pediatric Society Published a comprehensive guide on the safe use of mosquito repellents in children, summarized below.

• But first, some general do's and don'ts about insect repellent in children:

  
  

  ✅ Do's

  • Apply only a thin layer to exposed skin and the outside of clothing.

  • Spray products outdoors or in a well-ventilated area. Consider lotions, sticks, or pump sprays rather than aerosol.

  • Spray repellent onto your hands first, then apply it to your child's face, avoiding the eyes and mouth. Wash your hands thoroughly afterwards.

  • Reapply after swimming or as directed on the product label.

  • Wash repellent off with soap and water once it's no longer needed.

  • Apply sunscreen first, then wait 20 minutes before applying insect repellent.

    
    

  ❌ Don'ts

  • Don't let children under 10 years of age apply insect repellent themselves.

  • Don't apply repellent to your child's hands, eyes, mouth, cuts, scrapes, irritated skin, or sunburned skin.

  • Don't apply repellent under clothing. Only exposed skin or to the clothing itself.

  • Don't spray repellent inside tents, motorhomes, or other enclosed spaces.

  • Don't use combination insect repellent and sunscreen products.

  • Don't use permethrin-treated clothing for children under 16 years of age or while breastfeeding.

• Several 'natural' products are available, however not much is known about their safety or efficacy as Health Canada has not rigorously tested them. Here is a summary based on the Canadian Pediatric Society's recommendations:

Bottom line

Skeeter syndrome can look frightening, but it is not dangerous and usually resolves on its own in a couple of days.

Prevent mosquito bites with long clothing and an age-appropriate repellent.

If you're ever unsure whether your child's swelling is "just a mosquito bite" or something more serious, it's always appropriate to seek medical advice.

References

1) Canadian Paediatric Society. Insect repellents: How to protect your child from insect bites. Caring for Kids. Updated July 2023.

2) Stokes M, et al. Update on mosquito bite reaction: Itch and hypersensitivity, pathophysiology, prevention, and treatment. Frontiers in Allergy. 2022;3:975067. Available from: https://pmc.ncbi.nlm.nih.gov/articles/PMC9532860/

3) Peng Z, Simons FER. Mosquito allergy: Immune mechanisms and diagnosis of Skeeter syndrome. Allergy, Asthma & Clinical Immunology. Available from: https://pmc.ncbi.nlm.nih.gov/articles/PMC12621206/