Most people never notice their first mosquito bites. After being bitten several times, though, you're likely to start noticing, often almost immediately after the mosquito feeds. The signs include:

  • A puffy, white bump that appears a few minutes after the bite
  • A hard, itchy, reddish-brown bump, or multiple bumps, appearing a day or so after the bite or bites
  • Swelling around bites
  • Small blisters instead of hard bumps
  • Dark spots that look like bruises

In children and people with immune system disorders, mosquito bites sometimes trigger:

  • A large area of swelling and redness
  • Low-grade fever
  • Hives
  • Swollen lymph nodes

When to see a doctor

If mosquito bites seem to be associated with more-serious signs and symptoms — such as fever, headache and body aches — contact your doctor.

Oct. 24, 2012