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
Look up a symptom: Itching · Red spot, bump, or patch on the skin
When to get medical care
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:
| Medicine | Helps with | Good 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.