Bleeding Under the Toenail: What to Do and When to Get Help

Bleeding under a toenail often means a subungual hematoma: blood trapped beneath the hard nail plate after an injury. It can follow a stubbed toe, a dropped object or repeated pressure from tight shoes. The patch may look red, purple, brown or black. Pressure from the trapped blood can cause tenderness or throbbing, although some nail bruises are painless. Cleveland Clinic and DermNet describe these patterns.

A dark patch beneath an intact nail is different from blood actively coming out around a split or lifted nail. The first may be a bruise; the second needs wound care and may involve damage to the nail bed—the tissue beneath the nail.

When to get medical help

Seek urgent assessment today for intense or worsening pain, a substantially torn or lifted nail, or a suspected fracture. A clinician may need to examine the nail bed and arrange an X-ray. Get emergency care if bleeding will not stop with firm pressure, the wound is very deep, the toe is misshapen, bone is visible, or you develop numbness or tingling after the injury. A suspected broken big toe also needs emergency assessment. These signs can indicate more than a simple nail bruise. Cleveland Clinic, NHS toe-injury guidance and NHS wound guidance support these escalation points.

Also get medical advice if:

• The blood patch is expanding or covers much of the nail.
• Redness or swelling increases, pus appears, or you develop a fever—seek prompt care for these possible infection signs.
• You have diabetes and have injured your toe, even if the injury seems minor.
• The dark mark is unexplained, does not move outward as the nail grows, or forms a new or changing lengthwise band—especially if pigment extends onto nearby skin.

Not every dark nail is trapped blood. Nail melanoma is uncommon, but a suspicious mark needs examination rather than an assumption that shoes caused it. Cleveland Clinic, the American Academy of Dermatology, MedlinePlus, NHS and DermNet explain these concerns.

What you can do for a minor injury

Home care may be reasonable for a small bruise when the nail remains intact and attached, the toe looks normally aligned, and discomfort is mild and improving.

• Remove the pressure. Pause running or other activity that repeatedly strikes or squeezes the toe. Avoid tight or pointed shoes.
• Cool and elevate it. Apply an ice pack wrapped in cloth for up to 20 minutes at a time. Rest with your foot raised to help reduce throbbing. Do not put ice directly on skin.
• Use suitable pain relief. Acetaminophen/paracetamol or ibuprofen may help; follow the label and ask a pharmacist if you are unsure whether a medicine is safe for you.

These measures ease symptoms; they do not remove the trapped blood. MedlinePlus nail-injury guidance describes cooling, elevation and pain relief.

If a small surrounding wound is actively bleeding, apply firm pressure with a clean folded cloth or dressing. Once bleeding stops, rinse it with clean water and cover it with a sterile dressing. A little petroleum jelly can help prevent the dressing from sticking; keep adhesive off the injured nail. Do not pull off attached nail. For a detached nail, see what to do when a toenail falls off. NHS wound guidance and AAD nail-injury advice explain bleeding control, cleaning and protection.

Does the blood need draining?

Not every nail bruise needs drainage. For a painful, uncomplicated hematoma, a clinician may offer trephination: making a small opening in the nail to release blood and relieve pressure. It works best within 24–48 hours of the injury, so severe throbbing is a reason to seek assessment promptly—not to wait for the nail to grow out. An older painful injury still deserves assessment, even if drainage is less useful. Cleveland Clinic explains the procedure and timing.

Do not drill, pierce or burn a hole in your toenail yourself. You could cause infection or further damage and miss an underlying injury. Nail removal is not automatic: a large blood patch alone does not mean the nail must come off. The clinician checks whether the nail and surrounding tissues are intact or need repair. Cleveland Clinic and Emergency Care BC support this approach.

Check shoe length, width and depth

If bruising followed walking or running rather than a single impact, check the shoes used for that activity. Better fit can reduce repeat pressure, but it cannot treat a fracture or repair an injured nail bed.

Use these practical checks:

• Length: Allow about 1 cm beyond your longest toe, which may not be the big toe.
• Width: Choose a rounded toe box that does not squeeze the toes together.
• Depth: The upper should not press on the top of the injured nail. Width alone will not solve a shallow toe box.
• Hold: Use an adjustable fastening and a snug heel fit to hold the foot securely without tightening across the toes.

Try both shoes, and avoid hard seams or ridges over the sore area. These checks follow Oxford Health NHS podiatry footwear guidance. Keep toenails short without cutting into the skin; a wide toe box also helps prevent rubbing, according to the American Academy of Dermatology.

What healing should look like

Pain from a simple nail bruise often eases within days, while discoloration lasts much longer. As the nail grows, a clear area should appear near the cuticle and the dark patch should move toward the tip. Toenails recover slowly, so expect months rather than days for the mark to grow out. The damaged nail may loosen or be replaced by a new one. Cleveland Clinic, DermNet and MedlinePlus describe this recovery.

A dated photograph can help you track movement without repeatedly pressing or scraping the nail. If the change is unclear, use the warning signs above rather than color alone to decide on assessment.