Overview
Harvester ants in the southwest U.S. and velvet ants (wasps) cause very painful stings.
Allergic people may need epinephrine.
Symptoms
Common signs:
- Painful sting
- Bug bite or sting
Less common
- Swelling
When to get medical care
Call 911Trouble breathing or face swelling.
Get care todayNew or worse symptoms, or symptoms with fever.
See a doctor soonSymptoms that last or keep coming back.
Causes
Venom.
Diagnosis
A clinician asks about your symptoms and may order tests.
The exam
A physical exam.
Treatment
Treatment depends on the cause and how severe it is.
Self-care
- Wash
- Cold pack
- Take an antihistamine for itching
- Wash the sting
Prevention
To lower your risk or prevent problems:
- Wear shoes and gloves outdoors
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
- Children: Stings are more painful relative to size.
- People with allergies: Carry epinephrine.
Outlook
Pain fades over hours to days.
Most recover quickly.
Getting ready for your visit
Bring a list of your symptoms and medicines.
What to bring
- A list of your medicines and supplements
- Notes on when symptoms started and what makes them better or worse
Questions to ask
- What's causing this?
- What treatment do you recommend?
- Should I carry epinephrine?
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.
Sources
Last updated 2026-11-12.