Overview
Blood collects under the nail and builds pressure.
A dark streak under a nail without an injury needs a check for melanoma.
Symptoms
Common signs:
- Black or blue under a nail after an injury
- Throbbing pain
Less common
- Nail lifting or falling off
When to get medical care
Causes
A crush injury or repeated pressure (like running shoes).
Who is more likely to get it
- Tight shoes
- Running
Possible complications
Diagnosis
A clinician looks at the nail.
Questions you may be asked
- How it happened
The exam
Checking the finger or toe.
Tests
Tests, if needed:
- X-ray: If a bone might be broken.
Treatment
Most heal with home care.
Self-care
- Ice and raise the hand or foot
- Keep the nail trimmed and covered
Medicines
Medicines that may help:
| Medicine | Helps with | Good to know |
|---|---|---|
| Pain relievers | Pain |
OwieClear doesn't give doses: follow the label or your healthcare professional. Medicine names here are examples, not a full list.
A clinician can release the blood to ease pressure within the first day or two.
Prevention
To prevent it:
- Wear roomy shoes
- Use care with doors and tools
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
- Recovery time varies. Ask your care team when you can drive, lift, work, and exercise.
Outlook
The nail usually grows back normally.
Getting ready for your visit
Bring a list of your symptoms and medicines.
Questions to ask
- Will the nail fall off?
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 Blood under a nail (subungual hematoma)
Sources
Last updated 2026-11-12.