How to Get Rid of Dried Blood Under a Nail

Dried blood trapped under a fingernail or toenail, known medically as a subungual hematoma, usually resolves on its own as the nail grows out, but that process takes months. If the hematoma is fresh and painful, a doctor can relieve the pressure by making a small hole in the nail to drain the blood. Once the blood has already dried and the acute pain has passed, you are mostly waiting for healthy nail to replace the discolored portion. The timeline, the options for speeding things along, and the situations that warrant medical attention are all worth understanding before you decide to leave it alone or take action.

What Causes Blood to Pool Under the Nail

A subungual hematoma forms when a blow or crush injury damages the small blood vessels in the nail bed, the tissue directly beneath the hard nail plate. The blood leaks into the tight space between the nail bed and the nail plate, and because it has nowhere to go, it pools and clots. That trapped blood creates the dark red, purple, or blackish discoloration you see through the nail. When the hematoma is fresh and still liquid, the pressure it exerts on the sensitive nail bed nerves can be intensely painful.¹

Over the following days, the blood dries, and the throbbing typically eases. At that point you are left with what looks like a dark stain under the nail. The discoloration does not wash off because it is underneath the hard keratin plate, not on top of it. Once it is dry, there is no liquid left to drain, which limits what you can do to remove it quickly.

Will It Go Away on Its Own

Yes, in the vast majority of cases. As your nail grows, the dried blood slowly migrates toward the tip of the finger or toe and eventually gets trimmed away. Fingernails grow roughly three to four millimeters per month, so a hematoma near the base of the nail can take four to six months to fully disappear. Toenails grow about half as fast, so you might be looking at nine months to a year for a large toenail hematoma to grow out completely.

The discoloration often shifts in appearance during this process. It may lighten from near-black to brownish-purple as the hemoglobin in the dried blood breaks down. In some people, the nail plate itself develops a slight ridge or texture change over the damaged section. This is cosmetically annoying but usually temporary. Once the damaged portion of nail has grown past the free edge and been clipped away, the new nail growing in behind it is typically normal.

Draining a Fresh Hematoma

If the injury just happened and the blood is still liquid, medical drainage gives fast relief. The standard procedure, called nail trephination, involves making a small hole through the nail plate so the trapped blood can escape. A doctor may use a heated sterile needle, a cautery device, or a small drill. The nail plate itself has no nerve endings, so the hole does not hurt. The moment the blood drains, the pressure drops and the pain often resolves almost immediately.²

One concern people have about trephination is whether poking a hole through the nail invites infection or damages the nail permanently. A prospective study tracking patients who underwent the procedure found no cases of infection, bone infection, or significant nail deformities afterward, regardless of how large the hematoma was or whether a fracture was present underneath.³ That said, trephination is a clinical procedure and should be done under sterile conditions by a healthcare provider, not improvised at home with a safety pin.

There is a timing window. Once the blood has clotted and dried, usually within a day or two, trephination is no longer effective because there is no liquid to drain. At that point, your body simply reabsorbs what it can while the rest grows out with the nail.

What You Can Do at Home

If the hematoma is fresh (within the first few hours) and relatively small, basic first aid can reduce the amount of blood that accumulates. Elevating the hand or foot above heart level and applying an ice pack wrapped in a cloth for fifteen to twenty minutes helps constrict the damaged blood vessels. Over-the-counter pain relievers can take the edge off the throbbing. Avoid aspirin and ibuprofen in the first few hours if the bleeding is still active, because both thin the blood slightly and may increase the pooling. Acetaminophen is a safer initial choice for pain.

Once the blood has dried, the practical toolkit shrinks. You cannot scrub it off or dissolve it through the nail. Soaking the finger in warm water will not remove the discoloration, though it can soften the nail and feel soothing. Some people try to file the nail plate thinner to make the stain less visible, but this is risky because thinning the nail too much exposes the sensitive nail bed to pressure and potential infection. The honest answer is that dried blood under the nail is a cosmetic waiting game. The most effective strategy is to protect the nail, keep it trimmed, and let healthy growth replace the damaged section.

A few things genuinely help the cosmetic side. Keeping nails trimmed regularly means you are removing the discolored portion as soon as it reaches the free edge, shortening the visible duration. Dark nail polish can camouflage the stain on fingernails if the appearance bothers you. For toenails, a similar approach with polish or simply wearing closed-toed shoes works fine.

When to See a Doctor

Most small subungual hematomas are harmless and need no medical attention beyond basic home care. But several situations call for a professional evaluation, and it is worth knowing where the line is.

• Severe or worsening pain: If the throbbing does not ease over the first day or two, the pressure may need to be relieved through trephination before the blood finishes clotting.
• Large hematomas: When the discoloration covers more than about half the nail, the injury to the nail bed is more likely to be significant. Some guidelines suggest that when more than half the nail plate is involved and there is also a fracture of the underlying bone, the nail should be removed so the nail bed can be inspected and repaired.⁴
• Deformity or instability: If the nail is partially detached, cracked through, or the fingertip looks misshapen, there may be a fracture or laceration underneath that needs treatment.
• No clear injury: If you notice dark discoloration under a nail and cannot recall any trauma that caused it, the stain may not be blood at all. Melanoma and other conditions can mimic the appearance of a hematoma.
• Signs of infection: Increasing redness, warmth, swelling, pus, or red streaking away from the nail all warrant prompt medical attention.

Children who smash their fingers in doors or drawers often develop subungual hematomas. The same guidelines apply, though kids are less able to describe their pain level accurately, so erring toward a medical visit is reasonable when in doubt.

Is It Actually Blood, or Something Else

One of the most important reasons to pay attention to unexplained dark marks under your nails is that subungual melanoma, a rare but serious form of skin cancer, can look similar to a bruise at first glance. This is especially relevant when you notice a dark spot under a nail without remembering an injury.

Dermatologists use a few key features to tell the two apart. Subungual hematomas tend to appear as well-defined dark patches that are not connected to surrounding structures and often have a globular or crescent shape.⁵ They also migrate toward the tip of the nail as the nail grows, which is a reassuring sign. Melanomas, on the other hand, tend to show features that blood bruises do not: dark streaks running lengthwise down the nail, pigment spreading onto the skin surrounding the nail (called the Hutchinson sign), irregular band patterns, and sometimes ulceration. A study comparing the two found that features like the Hutchinson sign, irregular longitudinal lines, and ulceration appeared in a high percentage of nail melanomas but were absent in simple hematomas.⁶

A useful home test is to watch whether the dark mark moves with the growing nail over the course of a few weeks. Take a photo when you first notice it, then another a month later. If the mark has clearly shifted toward the tip, it is almost certainly trapped blood being carried forward by nail growth. If it stays in place near the base or seems to be getting larger, see a dermatologist. This migration test is not a substitute for professional evaluation when there is genuine concern, but it can be reassuring while you wait for an appointment.

What Happens to the Nail Afterward

For most minor to moderate hematomas, the nail recovers fully. You might see a slight ridge, a bump, or a whitish discoloration in the nail plate as it grows through the zone where the blood was pooled, but these cosmetic imperfections disappear once the affected section grows past the tip and gets trimmed.

Larger injuries are a different story. When the nail bed sustains significant damage from the initial trauma, the nail that grows back may be slightly different. It could be thicker, have a permanent subtle ridge, or grow with a slight curve it did not have before. In some cases the nail may temporarily detach from the nail bed entirely, a condition called onycholysis. This looks alarming because the nail turns white and lifts, but it is usually painless and the new nail growing in behind the detaching one pushes it out. The key is not to force a loosening nail off prematurely, since doing so exposes the nail bed and increases the risk of infection.

Toenail hematomas from running or hiking are a special category. Distance runners frequently develop subungual hematomas on their big toes from repetitive impact against the front of the shoe. These “runner’s toes” sometimes recur with every training cycle. Prevention matters more than treatment in this scenario: ensuring your shoes have about a thumb’s width of space between your longest toe and the shoe’s end, keeping toenails trimmed short, and using moisture-wicking socks to reduce friction all help. Some runners lose the same toenail repeatedly and still grow it back each time with no lasting damage.

Hematomas Under Acrylic or Gel Nails

Artificial nails add a layer of complication. If you develop a subungual hematoma while wearing acrylics, gels, or press-ons, the overlay makes it harder to see the extent of the discoloration and harder for a doctor to perform trephination. In some cases the artificial nail needs to be removed first, which can be uncomfortable when the underlying tissue is already injured and swollen.

There is also a subtler issue: artificial nails can mask slow-developing dark spots that are not from trauma. Because the overlay obscures the natural nail, you might not notice a suspicious pigmented lesion until the acrylic is removed weeks or months later. If you regularly wear opaque artificial nails, it is worth taking breaks between applications and checking your natural nails for any unexpected dark marks, especially near the base of the nail where melanoma typically starts.

Common Myths About Subungual Hematomas

A persistent piece of internet advice is to heat a paperclip and burn a hole through the nail yourself to drain the blood. While the basic concept is the same as medical trephination, doing it at home with unsterile tools in uncontrolled conditions is a recipe for infection. The sterile environment and training matter. In a clinical setting, trephination has an excellent safety record with no infections or major nail damage.³ That safety record is built on sterile technique, not on the concept of poking a hole in a nail being inherently safe.

Another common belief is that a black nail always means a fracture. While hematomas covering a large portion of the nail are more commonly associated with underlying fractures, plenty of people develop impressive-looking hematomas from relatively minor jams and stubs with no bone damage at all. If the fingertip is not deformed, you can move it through its full range without sharp pain, and the swelling is modest, a fracture is unlikely. When doubt exists, an X-ray settles the question quickly.

Some people also believe that once you have a hematoma, you should keep the nail soaked in water or hydrogen peroxide to break down the blood faster. Neither approach works. The nail plate is a tough keratin barrier that does not allow topical solutions to reach the blood trapped beneath it. Excessive soaking can actually soften the nail in an unhelpful way, making it more vulnerable to lifting or tearing. Keeping the nail clean and dry is a better strategy than any soak.

When Blood Under the Nail Keeps Coming Back

Recurrent subungual hematomas without obvious injury deserve attention. Repeated bleeding under the nails can be a sign of a bleeding disorder, a medication side effect (particularly from blood thinners), or a vascular issue. People on anticoagulant therapy sometimes develop hematomas from minor impacts they barely notice. If you find yourself frequently discovering dark spots under your nails without remembering significant trauma, mention it to your doctor. It may be a clue to something worth investigating.

In athletes, recurrence is more often mechanical than medical. Runners, tennis players, and soccer players who repeatedly stress their toenails during sport tend to develop hematomas in patterns tied to their activity. The solution is usually equipment-related rather than medical: better-fitting shoes, protective taping, or orthotic inserts to stabilize the foot inside the shoe. Addressing the repetitive trauma is more effective than treating the hematoma after each episode.