Overview
The blister roof protects the skin underneath.
Friction blisters form when skin rubs over and over, often from new shoes, sports, or tools.
The fluid inside keeps the raw skin underneath clean, so it's best to leave the roof on.
Symptoms
Common signs:
- Blisters
Less common
- Blood blister
When to get medical care
Call 911This isn't an emergency by itself. Call 911 for trouble breathing, chest pain, or fainting.
Get care todaySigns of infection, especially with diabetes.
See a doctor soonBlisters that keep coming back.
Causes
Friction.
Who is more likely to get it
- New shoes
Diagnosis
Usually no tests.
Treatment
Protect the blister.
Self-care
- Cover with a bandage or moleskin
- Don't pop it
- Change shoes
- Drain a big painful blister safely: wash, pierce the edge with a clean needle, leave the skin on, then cover
- Use moleskin with a hole cut around the blister
Prevention
To prevent:
- Well-fitting shoes
- Moisture-wicking socks
- Break in new shoes slowly
- Wear gloves for tool work
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
- Diabetes: Check feet daily; blisters can become ulcers.
Outlook
Heals in days.
Most heal in a week.
Getting ready for your visit
Bring a list of your symptoms and medicines.
Questions to ask
- Is this blister 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.
Sources
Last updated 2026-11-12.