About this article
Medically reviewed- Written by
- Dr Paul Watson
- Medically reviewed by
- Dr Han Simpson
- Published
- May 28, 2026
- Medical review date
- September 8, 2026
- Evidence searched through
- September 8, 2026
- Next review due
- September 8, 2027
- Intended audience
- General Readers & Patients
- Geographic scope
- Worldwide
- Conflicts of interest
- None declared.
- Funding
- Website Owner
- Report a correction
- Report an error or editorial concern
- Medical disclaimer
- Read the medical disclaimer
Black fly bites can cause painful, itchy, swollen skin reactions that often look worse than ordinary mosquito bites. Many people search for black fly bites pictures to compare symptoms and determine whether a skin reaction could be caused by black flies instead of fleas, mosquitoes, bed bugs, or other insects.
Pictures of black fly bites may show red swollen bumps, bleeding bite marks, blistering, bruising, or large itchy welts. Some bites appear mild, while others trigger significant inflammation and discomfort.
Understanding what black fly bites look like may help patients identify symptoms early and recognize when medical evaluation may be needed.
What Are Black Flies?
Black flies are small biting insects sometimes called:
- Buffalo gnats
- Turkey gnats
- Black gnats
They are commonly found near:
- Rivers
- Streams
- Lakes
- Forested areas
- Rural environments
Unlike mosquitoes, black flies cut the skin to feed on blood rather than piercing it with a needle-like mouthpart.
This can make black fly bites:
- More painful
- More swollen
- More inflamed
- More likely to bleed
Black Fly Bites Pictures: What Do Black Fly Bites Look Like?
Pictures of black fly bites often show:
- Red raised bumps
- Swelling
- Small bleeding spots
- Clusters of bites
- Redness surrounding the bite
- Itchy welts (advice here)
- Skin irritation
- Crusted bite marks
Some people develop large local allergic reactions that may look dramatic.
Mild Black Fly Bites Pictures
Mild black fly bites may appear similar to mosquito bites.
Pictures of mild bites may show:
- Small red bumps
- Mild itching
- Slight swelling
- Small pinpoint bite marks
Symptoms often improve within several days.
Severe Black Fly Bite Pictures
More severe black fly reactions may show:
- Large swollen welts
- Significant redness
- Bruising
- Blistering
- Bleeding skin
- Intense itching
- Painful swelling
Severe reactions are more common in sensitive individuals or after multiple bites.
Black Fly Bite Pictures on Legs
Black flies frequently bite exposed skin on the legs and ankles.
Pictures may show:
- Clusters of red bites
- Swollen lower legs
- Itchy patches
- Circular welts
- Inflamed skin
Outdoor activities near water often increase exposure risk.
Black Fly Bite Pictures on Arms and Neck
Black flies also commonly bite:
- Arms
- Hands
- Neck
- Face
- Shoulders
Pictures may show grouped bites on exposed skin areas.
Black Fly Bite Healing Stages Pictures
The appearance of black fly bites often changes during healing.
Early Stage
- Redness
- Swelling
- Itching
- Mild bleeding
Intermediate Stage
- Crusting
- Scabbing
- Reduced swelling
- Darker discoloration
Late Healing Stage
- Fading redness
- Reduced itching
- Skin healing
- Mild temporary discoloration
Most bites heal within 1–2 weeks.
Why Black Fly Bites Swell So Much
Black fly saliva contains substances that trigger inflammation and immune reactions.
This may cause:
- Significant swelling
- Intense itching
- Burning sensation
- Large welts
Some individuals develop exaggerated allergic reactions.
Black Fly Bites vs Mosquito Bites Pictures
Many people confuse black fly bites with mosquito bites.
Black Fly Bites
Black fly bites are more likely to cause:
- Painful bites
- Bleeding
- Large swelling
- Skin tearing
- Clusters of inflamed bumps
Mosquito Bites
Mosquito bites are usually:
- Smaller
- Softer
- Less painful
- Less likely to bleed
Black Fly Bites vs Bed Bug Bites Pictures
Black fly bites and bed bug bites may sometimes look similar.
Black Fly Bites
- Usually outdoors
- Often painful
- May bleed
- Frequently swollen
Bed Bug Bites
- Often occur overnight
- Commonly appear in lines
- Usually found after sleeping
- Typically not associated with bleeding bite centers
Symptoms of Black Fly Bites
Common symptoms include:
- Itching
- Swelling
- Redness
- Burning
- Pain
- Bleeding
- Scabbing
- Skin warmth
Some people may also develop:
- Headache
- Mild fever
- Enlarged lymph nodes
- Fatigue
after numerous bites.
Infected Black Fly Bite Pictures
Scratching black fly bites may lead to secondary infection.
Pictures of infected bites may show:
- Pus
- Increasing redness
- Warmth
- Drainage
- Severe swelling
- Crusting
- Expanding rash
Medical treatment may be needed for infected bites.
Black Fly Bite Allergic Reactions
Some people develop stronger allergic reactions called “black fly fever.”
Symptoms may include:
- Fever
- Nausea
- Severe swelling
- Enlarged swollen lymph nodes
- Joint pain
- Headache
Severe allergic reactions are uncommon but possible.
How Doctors Diagnose Black Fly Bites
Doctors usually diagnose black fly bites through:
- Physical examination
- Bite appearance
- Exposure history
- Outdoor activity history
Laboratory testing is rarely needed.
Treatment for Black Fly Bites
Most black fly bites improve with conservative treatment.
Common treatments include:
- Ice packs
- Antihistamines
- Hydrocortisone cream
- Anti-itch creams
- Oral pain relievers
- Gentle skin cleansing
Avoid scratching to reduce infection risk.
Home Remedies for Black Fly Bites
Some home care measures may help relieve symptoms.
Helpful options include:
- Cold compresses
- Aloe vera
- Calamine lotion
- Oatmeal baths
- Elevation for swollen limbs
When to See a Doctor
Medical evaluation may be needed if symptoms include:
- Severe swelling
- Difficulty breathing
- Fever
- Spreading redness
- Pus drainage
- Severe pain
- Large blistering
- Persistent symptoms
These symptoms may suggest infection or significant allergic reaction.
How to Prevent Black Fly Bites
Preventive measures include:
- Wearing long sleeves
- Using insect repellent
- Avoiding rivers during peak black fly seasons
- Wearing light-colored clothing
- Using protective netting
Black flies are often most active during daytime hours.
Black Fly Bites Pictures: Final Thoughts
Black fly bites pictures commonly show swollen red bumps, itchy welts, bleeding bite marks, and inflamed skin reactions that may appear more severe than mosquito bites.
While most bites heal naturally, some people develop large allergic reactions or skin infections requiring treatment.
Recognizing what black fly bites look like may help patients identify symptoms early and seek medical care when necessary.
Read our spider bite pictures article too.