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The Scream Is Loud. Here’s How to Tell a Bruise From an ER Trip.
If your child’s finger has been crushed in a door:
- comfort them,
- raise the hand,
- press a clean cloth on any bleeding, and
- wrap a cold pack in a cloth and hold it over the finger for 10 to 15 minutes.
Many door injuries are painful bruises that settle within days. Go to urgent care or the ER TODAY if bleeding won’t stop after 10 minutes of pressure, the nail has lifted or torn, the tip is cut or hanging, the finger looks bent, or there’s a painful black pool of blood under most of the nail.
Your child is screaming. You’re trying not to. The finger looks…swollen? Purple? Fine? And the nail looks a bit wrong but you can’t tell.
A child’s fingertip injury that looks like a small cut at the base of the nail can hide a broken growth plate underneath. That one is an open fracture. It needs cleaning and antibiotics, and often a washout. Leave it at home for a few days and it can get infected and affect how the nail and the bone grow.
In Closing Window terms, a bruise runs on an OPEN window: time does the work. A lifted nail with blood coming from under the cuticle runs on a CLOSING one, and the clock is hours, not weeks. The rest of this page helps you tell which one you’re holding.
I remember…when my younger kiddo was 1+ years old and didn’t know better…he…thank God…sloooooowly closed a door onto my older kiddo’s finger, at the door joint, and that was a terrible location to have a finger at.
She kept crying more than 10 minutes, and I figured that it’s not a simple crush injury, there must have been something happened to the bone, and I rushed her to the hospital. By then, she was whimpering, but settled in a bit more, and we did an X-ray…saw a crush fracture but fairly stable.
The doctor gave her some painkillers and I can’t remember (at this point, it was 8-9 years ago) if I splinted it or not but we have to be very careful of splinting for young children…as it IS a choking hazard. But it was resolved fairly quickly, thank God.
What to do right now
- Stay calm. Children read your face before they read their finger.
- Check the whole finger: bleeding, the nail, the tip, whether it looks straight, and whether the skin color matches the finger next to it.
- Press gently on bleeding with a clean cloth for 10 minutes without lifting to check.
- Raise the hand above the heart. A pillow on the couch works.
- Cold pack wrapped in a cloth, 10 to 15 minutes at a time, never ice directly on the skin.
- Pain relief: children’s acetaminophen or ibuprofen at the dose on the pack for their age and weight.
- Take off rings on that hand now, before the swelling arrives.
- If part of the fingertip has come off, wrap it in damp gauze, seal it in a plastic bag, and place the bag on ice. Bring it with you. See fingertip injuries.
Is it broken? How to tell a bruise from a fracture
You can’t see a fracture from the outside. But you can see how the child behaves, and that tells you a lot.
- Probably a bruise: crying settles within 10 to 15 minutes of comfort, the finger looks straight, the nail is sitting flat, and within the hour they’re using the hand again to grab a toy or a snack.
- Needs an X-ray: crying that won’t settle after 10 to 15 minutes of proper comfort, a child who keeps holding the hand and won’t use it, swelling right over a joint, or pain that’s still sharp the next morning.
- Needs to be seen today: anything on the list at the end of this page.
My rule, straight from the story above: if the crying doesn’t settle the way a normal bump settles, trust that. Small children can’t describe pain. They show it.
The injury that’s easy to miss
In children, a crush can break the growth plate at the base of the fingertip bone and tear the nail bed at the same time. Doctors sometimes call it a Seymour fracture.
- What it looks like: the fingertip droops like a mallet finger, the base of the nail has lifted up out of the skin fold, and there’s bleeding from under the cuticle.
- Why it matters: it’s an open fracture. Left untreated, it can become infected and affect nail and bone growth.
- What happens: cleaning, antibiotics, putting the nail bed back in place, and a splint. Sometimes a small pin holds the bone.
It looks like “just a cut near the nail.” That’s exactly why it gets missed. See growth plate fractures in children.
Children’s fingertips heal astonishingly well. What they can’t do is heal around an infection or a nail bed that was left torn.
What about the black blood under the nail?
That’s a bruise trapped under the nail. Doctors call it a subungual hematoma.
- Small, and not very painful: leave it. It grows out with the nail over months.
- Large, tight and throbbing: a doctor can release the pressure through a tiny hole in the nail. The relief is usually immediate, and it works best in the first day or two.
- Blood under the nail plus a lifted nail or a cut across it: that’s not just a bruise. Go today.
Will the nail fall off? Will it grow back normally?
- A badly bruised nail often lifts and falls off over the following weeks. A new nail is usually already growing underneath.
- Regrowth takes around four to six months in children. It may look ridged or bumpy for a while. See nail changes after injury.
- A torn nail bed that was repaired usually grows a decent nail. A torn nail bed left unrepaired is the one that can grow a permanently split or ridged nail.
How long does a crushed finger take to heal in a child?
This depends entirely on what was crushed. Here’s the honest range.
- Bruise, days 0 to 2: swelling and bruising. Cold packs, elevation, pain relief.
- Bruise, days 3 to 7: pain settling. Your child starts using the finger in play.
- Bruise, weeks 1 to 3: bruising fades. A dark nail may grow out over months.
- Fingertip fracture: usually protected in a splint or dressing for around 3 to 4 weeks, sometimes longer, as the treating doctor decides. Children’s fingertip bones heal faster than adults’.
- Open growth plate fracture with nail bed repair: antibiotics, a splint for around 4 weeks or more, and wound checks along the way.
Splints on small children: the safety catch
This is the part I mention in the story, and it’s the part most leaflets skip. A tiny finger splint on a toddler is a choking hazard. Toddlers pull things off and put them in their mouths. It’s basically their job.
- Tape it well and check it several times a day.
- Count the pieces. If a splint or a cap goes missing, find it before you assume it’s under the couch.
- Bigger is safer. For very young children, a bulkier dressing that covers more of the hand is often harder to remove and harder to swallow.
- Check the fingertip color past the tape. Pink is good. Pale, blue or very cold means it’s too tight.
- Once healed, a fingertip protector splint can keep a tender tip safe from knocks during play.
When can my child go back to school, swimming and sport?
- School or daycare: a bruised finger can go back the next day. A treated fracture can usually go back within a day or two, with a note for the teacher about the splint.
- Swimming and baths: keep any wound and dressing dry until it’s healed and the doctor is happy. Pool water and an open fingertip wound don’t mix.
- Ball games and rough play: bruise, as comfort allows. Fracture, once the doctor clears it, usually around 4 to 6 weeks.
- Musical instruments and handwriting: let pain guide it. Most kids work around one sore finger surprisingly quickly.
(Children are much better at ignoring an injured finger than adults are. That’s great for recovery and terrible for keeping a splint on.)
Watch for infection after treatment
Throbbing that gets worse instead of better after day 2, redness spreading up the finger, pus, or a fever. Those go back to a doctor the same day. See infected finger.
Preventing the next one
- Finger guards on the hinge side of doors, where the gap closes with the most force.
- Door stoppers for heavy doors and car doors in play areas.
- Teach “hands in” before closing car doors.
- Watch the other hazards at finger height. See hand dryer finger injuries and safety tips.
For older children and adults, see crushed fingertips and nail bed injuries.
Go to the ER or urgent care today if
- You can see bone, or part of the tip is cut, flapping or missing.
- The finger is pale, blue or cold.
- Bleeding doesn’t stop with 10 minutes of firm pressure.
- The nail is lifted, torn, or partly off.
- There’s a cut across the nail or at the base of the nail fold.
- The finger looks bent, crooked or shorter.
- The tip droops and your child can’t straighten it.
- Blood under the nail is painful and covers most of it.
Get it checked within a day or two if
- Your child still won’t use the finger after 2 to 3 days.
- Swelling and pain aren’t settling after 2 to 3 days.
- A joint in the finger stays swollen or won’t bend fully after a week.
- The nail grows back split, lifted or misshapen.
Bruised and settling can stay home. Nail lifted, tip bent or bleeding that won’t stop goes in today.
Written by Nigel Chua, hand occupational therapist in practice since 2005. Thousands of hands, wrists and elbows assessed and treated. My credentials are here. This article explains; it doesn’t examine. A child who still won’t use a finger the day after a door injury deserves an X-ray.
Every article on this site is written using the Closing Window Method: name the window your condition runs on, find where you are in it, and act while it’s still open.