A finger slammed in a door can be very painful and may cause more than a simple bruise. A door-crush injury can affect the skin, nail, nail bed (the tissue beneath the nail), fingertip bone, nerves, or tendons. Many mild injuries can be cared for at home, but a torn or lifted nail, severe throbbing pressure under the nail, loss of feeling, trouble moving the finger, or a finger that looks bent should be checked promptly.

The most important first steps are to remove rings before swelling worsens, control bleeding, protect the finger, and use a wrapped cold pack. Do not try to puncture a dark or painful fingernail yourself to release blood. A clinician can decide whether drainage, an X-ray, a splint, wound repair, or tetanus vaccination is needed.[1][2]

What can happen when a finger is caught in a door?

A door can squeeze the fingertip with considerable force. The appearance of the injury does not always show how much tissue underneath has been affected. Common injuries include the following.

Bruising and swelling

A minor crush can cause soreness, swelling, and purple or red discoloration. The fingertip may be tender for several days, especially when bumped or used for gripping.

Blood under the nail

A dark red, purple, or black area under the nail is often a subungual hematoma, meaning blood has collected beneath the nail. It can cause intense, throbbing pain because pressure builds in a small enclosed space. A nail may remain attached even when the nail bed underneath is injured.[1][2]

Nail or nail-bed injury

The nail may crack, split, partly pull away, or become loose at its base. The soft tissue under the nail can also be cut. Nail-bed injuries matter because more significant damage can affect how the nail grows back.[1][2]

Fingertip fracture

A crush injury can break the small bone at the tip of the finger. This may occur along with a nail-bed injury, sometimes even if the nail looks mostly intact. Swelling, marked tenderness, a dark nail, or pain when lightly pressing the fingertip can occur with a fracture, but an X-ray is usually needed to know for sure.[2]

Nerve, tendon, or circulation problems

Less commonly, a severe injury can affect sensation, blood flow, or the ability to bend or straighten the finger. These problems need urgent evaluation because prompt treatment can help protect finger function.

First aid for a finger slammed in a door

Start care as soon as you can. If there is a major crush, the finger looks badly deformed, or bleeding is severe, skip home care and seek emergency help.

1. Remove rings immediately. Swelling can develop quickly. If a ring will not come off easily, do not force it or cut the skin trying to remove it; seek help promptly.
2. Check for severe bleeding or an open injury. Apply steady, direct pressure with clean gauze or a clean cloth. If bleeding does not stop after 10 minutes of firm pressure, seek urgent medical care.[3]
3. Rinse a small cut gently. Use clean running water. Wash the skin around the wound with soap and water, but do not scrub deeply into a wound or pull at an attached nail.
4. Cover the injury. Use a clean, nonstick dressing or bandage if there is a cut, bleeding, or a damaged nail. Keep the bandage comfortably loose. A tight wrap can worsen pain or reduce circulation.
5. Use a cold pack. Place ice or a cold pack inside a cloth and apply it for about 15 to 20 minutes at a time. Do not put ice directly on the skin. Keep the hand elevated above heart level when possible to help limit swelling.[1]
6. Rest and protect the finger. Avoid sports, heavy lifting, forceful gripping, and activities that could bump the injury again until pain and swelling improve or a clinician advises otherwise.

If the nail is dark and pressure is painful, it may be tempting to make a hole in the nail at home. Do not use a needle, heated paper clip, drill, or other household tool to drain it. This can cause a burn, introduce infection, or worsen an unrecognized nail-bed injury. When drainage is appropriate, it should be performed using clean medical technique after the finger has been assessed.[1][2]

When home care may be reasonable

Home care may be reasonable when the injury is mild and all of the following are true:

• Bleeding has stopped quickly.
• The skin has only a small superficial scrape or no break in the skin.
• The nail is intact and remains attached.
• The dark area under the nail is small and pain is manageable.
• The finger is not crooked, flattened, or unusually shaped.
• You can feel the fingertip and can gently bend and straighten it.
• The fingertip is warm and has its usual color.

Even with a mild injury, reassess the finger over the next day or two. Increasing pain, swelling, redness, or drainage can be a reason to contact a clinician.

When to go to urgent care for a door-crush injury

Urgent care may be a good option for a finger injury that needs same-day assessment but does not appear life-threatening. Depending on the facility, clinicians may examine the nail bed, check motion and sensation, clean and dress the wound, obtain an X-ray, provide a splint, and arrange follow-up if needed.

Seek urgent care promptly if you have any of these concerns:

• A dark collection of blood under a large part of the nail, especially with strong throbbing or pressure.
• A nail that is cracked, split, partly detached, lifted at the base, or pushed out of position.
• A cut near the nail, a deep cut, a gaping wound, or bleeding that is difficult to control.
• Significant swelling or tenderness at the fingertip, especially if a fracture is possible.
• Inability to fully bend or straighten the finger, or pain that makes movement very difficult.
• Numbness, tingling, reduced sensation, or ongoing hypersensitivity.
• A finger that appears bent, rotated, shortened, or otherwise deformed.
• An injury caused by a dirty object or an open crush wound when tetanus vaccination status is unknown or may not be up to date.

A clinician may take X-rays because door-crush injuries can involve a fingertip fracture along with nail-bed damage. They will also check blood supply and the ability to move the finger, which can help identify injuries that need more specialized treatment.[2]

When to seek emergency care or call 911

Go to an emergency department now for a severe finger injury, including:

• Complete or partial amputation of the fingertip.
• Bone that is visible, a deep open wound, or a severely crushed fingertip.
• Bleeding that will not stop with firm direct pressure.
• A fingertip that is pale, blue, gray, cold, or becoming increasingly numb.
• A major deformity or a finger that is trapped and cannot be safely released.
• Severe pain with rapidly worsening swelling, particularly if a ring cannot be removed.

Call 911 if there is life-threatening bleeding, the person is fainting or unresponsive, or safe transportation to emergency care is not available. If part of the finger has been completely cut off, wrap it in clean, moist gauze, place it in a sealed bag, and place that bag on ice or in cold water. Do not put the body part directly on ice. Bring it with the person to emergency care.

Should you worry about tetanus?

Tetanus is not a concern from a simple closed bruise with intact skin. However, an open crush injury can be considered a higher-risk wound, particularly when tissue is damaged or the wound is contaminated. Clinicians consider the type of wound and your vaccination history when deciding whether a tetanus vaccine or other prevention is needed.[4]

Tell the clinician if the wound is dirty, if you do not know when you last received a tetanus-containing vaccine, or if you have not completed the recommended vaccine series. Do not use antibiotics solely to prevent tetanus; wound cleaning and vaccination assessment are the appropriate preventive steps.[4]

Pain relief and medication precautions

A cold pack, elevation, and protecting the finger are often helpful during the first day or two. Some people may also use an over-the-counter pain reliever, such as acetaminophen or an anti-inflammatory medicine, if it is safe for them.

• Follow the package directions and do not take more than the labeled amount.
• Check the active ingredients in all medicines. Acetaminophen is included in many cold, flu, sleep, and prescription pain products, so taking more than one acetaminophen-containing medicine can accidentally lead to an overdose.[5]
• Ask a pharmacist or clinician before using an anti-inflammatory medicine if you have kidney disease, a history of stomach ulcers or gastrointestinal bleeding, are taking blood thinners, have certain heart conditions, are pregnant, or have been told to avoid these medicines.
• For children, use only a product that is appropriate for the child’s age and follow the product label or a clinician’s advice. Do not estimate a child’s dose from an adult product.

Do not use pain medicine to push through severe symptoms or delay evaluation of a possible fracture, open wound, or circulation problem.

What to expect during healing

A mild bruise may improve steadily over several days, although the fingertip can remain tender for a week or longer. Swelling should gradually decrease, not continue to worsen.

If blood is trapped under the nail, the dark area will usually move outward as the nail grows. A damaged nail may loosen or fall off. The nail bed often heals within about 7 to 10 days, but a new fingernail can take roughly 4 to 6 months to grow back. The new nail may have ridges, grooves, or a changed shape, particularly after a more serious nail-bed injury.[1]

Follow any instructions you receive about dressing changes, splint use, activity restrictions, and follow-up. Do not stop using a prescribed splint early without checking with the clinician who evaluated the injury.

Watch for infection or delayed problems

Contact a clinician if the injury develops increasing redness, warmth, swelling, worsening pain after initial improvement, pus-like drainage, red streaks, or fever. These can be signs of infection. Also arrange care if the nail becomes increasingly loose, the finger remains very painful, sensation does not return, or you cannot regain normal movement.[1]

Some people have fingertip sensitivity or altered sensation for weeks or months after a significant crush injury. A nail may also grow back unevenly after nail-bed trauma. Follow-up is important if symptoms interfere with work, school, hand use, or daily activities.[1][2]

Special considerations for children

Door-crush injuries are common in young children, whose fingertips can be caught near the hinge side of a closing door. Seek prompt evaluation for a child with a torn nail, bleeding around the nail, a dark and painful nail, a finger that looks misshapen, or a child who will not use the finger normally. Because young children may not be able to describe numbness or pinpoint where it hurts, it is reasonable to have a lower threshold for medical assessment after a substantial crush injury.

Bottom line

A finger slammed in a door may be a bruise, but it can also involve the nail bed or fingertip bone. Remove rings, control bleeding, use a cloth-wrapped cold pack, and protect the injury. Get same-day care for a damaged nail, severe throbbing under the nail, suspected fracture, numbness, impaired movement, or an open wound. Seek emergency care for uncontrolled bleeding, circulation changes, exposed bone, severe crushing, or amputation.

References

1. MedlinePlus Medical Encyclopedia. Nail injuries. Updated October 1, 2025. Available from: https://medlineplus.gov/ency/patientinstructions/000800.htm
2. American Society for Surgery of the Hand. Nail bed injury. Available from: https://www.assh.org/handcare/condition/nail-bed-injury
3. MedlinePlus. First aid. Available from: https://medlineplus.gov/firstaid.html
4. Centers for Disease Control and Prevention. Clinical guidance for wound management to prevent tetanus. Updated June 10, 2025. Available from: https://www.cdc.gov/tetanus/hcp/clinical-guidance/index.html
5. U.S. Food and Drug Administration. Acetaminophen: what you should know about using acetaminophen safely. Available from: https://www.fda.gov/drugs/safe-use-over-counter-pain-relievers-and-fever-reducers/acetaminophen