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Mosquito bites

Also called: Mosquito bites, skeeter syndrome

Itchy, puffy bumps from a mosquito's saliva. Most fade in a few days. In some parts of the world, mosquitoes also spread illnesses like West Nile, dengue, and malaria.

TypeInsect bites
Usually lastsA few days
Watch forFever after bites, especially after travel

Overview

Female mosquitoes bite to get blood. The itchy bump is a reaction to their saliva.

Some people, often children, get large, warm, swollen reactions called skeeter syndrome.

Symptoms

Common signs:

  • Bug bite or sting: itchy, puffy bumps
  • Itching
  • Red spot, bump, or patch on the skin

Less common

  • Small blisters
  • Bruise-like spots

When to get medical care

Call 911Trouble breathing or swelling of the face or throat.
Get care todayFever, bad headache, stiff neck, confusion, or rash after mosquito bites.
See a doctor soonA bite that looks infected: warm, more painful, pus, or a red streak.

Causes

A reaction to mosquito saliva.

Who is more likely to get it

  • Spending time outdoors at dawn and dusk
  • Travel to the tropics

Possible complications

Diagnosis

Most bites don't need a visit.

Questions you may be asked

  • Fever, rash, or travel

The exam

A skin check.

Tests

Tests, if needed:

  • Blood tests: If fever or illness follows, to check for mosquito-spread infections.

Treatment

Most bites get better with simple care.

Self-care

  • Wash with soap and water
  • Use a cold pack
  • Don't scratch: trim nails and cover bites on kids

Medicines

Medicines that may help:

MedicineHelps withGood to know
Anti-itch creams
Itching
Antihistamines
Itching and swellingDiphenhydramine causes sleepiness.

OwieClear doesn't give doses: follow the label or your healthcare professional. Medicine names here are examples, not a full list.

Prevention

To prevent bites:

  • Use repellent with DEET, picaridin, IR3535, or oil of lemon eucalyptus
  • Wear long sleeves and pants
  • Empty standing water
  • Use screens and bed nets

Which doctor treats this

  • Urgent care or the ER can treat it first. For minor problems, your primary care provider can help.

Back to school, work, or sports

  • Most people can go to school or work. Keep the wound clean and covered.
  • Avoid pools and hot tubs until the skin heals.

Outlook

Bites heal in days. Prevention matters most where mosquitoes spread disease.

Getting ready for your visit

Bring a list of your symptoms and medicines.

What to bring

  • Recent travel

Questions to ask

  • Do I need tests for a mosquito-spread illness?

Research studies

Research studies test new ways to find and treat health problems. Some are looking for volunteers. Talk with your doctor before joining one.

Search ClinicalTrials.gov for studies on Mosquito bites

Sources

Last updated 2026-11-12.