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Horse fly, deer fly, and other biting fly bites

Also called: Horse fly bite, deer fly bite, biting flies

Painful bites from large flies, causing itchy, swollen bumps.

UsuallyHarmless

Overview

Horse flies and deer flies cut the skin to drink blood, so bites hurt right away.

Deer flies can rarely spread tularemia.

Symptoms

Common signs:

  • Painful fly bite
  • Bug bite or sting
  • Red spot, bump, or patch on the skin
  • Itching

Less common

  • Swelling
  • Itching for days

When to get medical care

Call 911Trouble breathing.
Get care todaySpreading redness.
See a doctor soonBite not healing.

Causes

Flies.

Who is more likely to get it

  • Outdoors

Diagnosis

Diagnosis by looking.

Treatment

Clean and soothe.

Self-care

  • Wash
  • Cold pack
  • Wash with soap and water
  • Use a cold pack for swelling
  • Take an antihistamine for itching

Medicines

Medicines that may help:

MedicineHelps withGood to know
Anti-itch
Itch

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

Prevention

To lower your risk or prevent problems:

  • Repellent
  • Wear light-colored clothing
  • Use insect repellent

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.

Children, pregnancy, and older adults

  • Outdoor workers: Most bites.

Outlook

Heals.

Bites heal in a few days.

Getting ready for your visit

Bring a list of your symptoms and medicines.

Questions to ask

  • Is this bite infected?

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 Horse fly, deer fly, and other biting fly bites

Sources

Last updated 2026-11-12.