Hives from mosquito bites: what to know

A mosquito bite commonly forms a small, itchy bump at the bite site. Hives are usually broader, raised welts that can join together and appear away from the bites; they may fade in one place and return in another. Some people develop a more pronounced local reaction after a bite. Persistent redness, warmth, pain, crusting, or pus suggests irritation or infection rather than typical hives. Learn more about [Hives](/conditions/urticaria/) and [Itchy Skin](/symptoms/itchy-skin/).

Wash the skin gently, apply a cool compress, and keep fingernails short. Avoid scratching, fragrances, and hot water, which can intensify discomfort. Use an insect repellent and cover exposed skin to reduce further bites, following product directions. A pharmacist can advise whether [Antihistamine Treatment](/treatments/medical-dermatology/oral-antihistamine-therapy/) is suitable, especially for a child, pregnancy, or other medicines. Photograph changing welts and note new bites or foods.

Call emergency services for breathing difficulty, wheezing, throat tightness, trouble swallowing, faintness, or swelling of the tongue, lips, or mouth. Seek medical advice for extensive or recurrent welts, severe local swelling, fever, increasing pain, pus, or redness spreading from a bite. Facial or eyelid [Skin Swelling](/symptoms/skin-swelling/) deserves prompt attention, particularly if it is progressing.

Do these areas look like hives or bite reactions? What can I use for the itch? How can I prevent new bites? Could this be [Angioedema](/conditions/angioedema/), and which symptoms mean I should seek emergency care?