A slammed car door. A misplaced hammer. A finger caught between two objects. A fall that damages the fingertip. Fingernail injuries happen quickly, and they can look much worse before they look better. A nail may turn black or purple, partially detach, fall off completely, or begin growing back with ridges or an unusual shape.
That leaves many people wondering: Will my fingernail heal normally, or did I permanently damage it? The answer depends less on the appearance of the nail itself and more on what happened to the structures underneath it.
Why the Nail Bed Matters After a Fingernail Injury
The hard fingernail you see is called the nail plate. It is made primarily of keratin and doesn’t contain nerves, which is why clipping your nails doesn’t hurt. Underneath it, however, is living tissue. The nail bed supports the nail, while the nail matrix, located near the base of the nail, produces the cells that allow a new fingernail to grow.
When someone experiences a significant fingertip or fingernail injury, damage can extend beyond the visible nail. That’s important because an injury involving the nail bed or nail matrix can affect how the nail heals and, in some cases, how it grows in the future.
My Fingernail Turned Black After an Injury. What Happened?
One of the most noticeable changes after hitting or crushing a fingernail is dark discoloration underneath the nail. This is often caused by blood collecting beneath the nail plate, known as a subungual hematoma. Depending on the severity of the injury, the nail may appear red, purple, dark brown, or black.
Small areas of discoloration may simply grow outward with the nail over time. Larger injuries can cause considerable pressure and throbbing pain and may accompany other fingertip injuries. If there is severe pain, significant bleeding, a deep cut, or concern that the finger may be fractured, the injury should be medically evaluated.
What If My Fingernail Is Coming Off?
After trauma, a fingernail may become loose or partially separate from the nail bed. Sometimes the damaged nail eventually falls off as a new nail begins growing underneath it.
Although that can look alarming, losing the visible nail does not necessarily mean you’ve permanently lost the ability to grow a fingernail. The bigger question is whether the nail matrix was damaged. If the matrix remains healthy, a new fingernail can generally grow. If the matrix has been significantly injured or scarred, however, the new nail may develop ridges, splitting, irregular thickness, or another permanent change in appearance.
How Do You Know If You Damaged Your Nail Bed?
Not every nail injury requires treatment from a hand specialist, but certain symptoms deserve closer attention.
Consider seeking medical evaluation if you experience:
- A deep cut through or around the nail
- A nail that has been significantly lifted or torn away
- Severe or worsening pain
- Heavy bleeding
- Significant swelling
- A fingertip that appears crooked or deformed
- Difficulty bending or straightening the finger
- Numbness or loss of sensation
- Signs of infection, such as increasing redness, warmth, drainage, or swelling
- A nail that grows back significantly deformed after an injury
Crush injuries can also cause fractures of the small bone at the end of the finger, so what initially looks like “just a fingernail injury” may involve more than the nail itself.
Will a Damaged Fingernail Grow Back Normally?
Often, yes. Fingernails grow slowly, however, so determining what the final nail will look like requires patience. A completely new fingernail generally takes several months to grow from the base to the fingertip.
During that process, the new nail may initially look uneven or different from the nail you had before the injury. The long-term appearance depends partly on the severity and location of the original injury. Damage involving the nail matrix has a greater potential to affect future nail growth.
Why Is My New Fingernail Growing Back With Ridges?
Seeing an unusual-looking nail emerge after an injury doesn’t automatically mean something went wrong.
Trauma can temporarily disrupt nail production. As the nail grows, you may notice:
- Horizontal or vertical ridges
- Uneven thickness
- A rough surface
- Changes in shape
- Splitting
- Discoloration
Some changes gradually disappear as healthier nail grows outward. Others can persist when the nail-producing structures were damaged. If your fingernail continues to grow abnormally, becomes painful, or isn’t progressing as expected, a hand specialist can evaluate whether there may be lasting nail bed or matrix damage.
Should You Pull Off a Damaged Fingernail?
Generally… no! Don’t forcibly remove a nail simply because it has become loose after an injury. The remaining nail may still provide some protection to the sensitive tissue underneath. Pulling it off can cause additional trauma, bleeding, and discomfort.
If a nail is severely damaged, partially detached, or interfering with healing, a medical professional can determine the appropriate way to manage it.
When Is a Fingernail Injury Actually a Hand Injury?
This is perhaps the most important distinction. A fingernail injury doesn’t always stop at the fingernail. A force strong enough to crush or severely damage a nail can potentially injure the nail bed, fingertip, bone, tendon, or surrounding soft tissue as well. That’s why persistent pain, numbness, limited movement, deformity, or significant swelling shouldn’t be dismissed simply because the most obvious damage happens to be the nail.
When to See a Hand Specialist for a Fingernail or Fingertip Injury
Minor nail injuries often heal with time and appropriate home care. More significant injuries may benefit from prompt evaluation, particularly when there is concern about the nail bed, fingertip, or underlying bone.
Dr. Avery Arora treats injuries and conditions affecting the fingers, hands, wrists, and elbows for patients throughout Southeast Michigan, with office locations in West Bloomfield, Macomb, and Howell.
If you’ve injured a fingernail and are concerned about persistent pain, abnormal nail growth, nail bed damage, or another injury to your finger, schedule an evaluation with Arora Hand Surgery.
Frequently Asked Questions About Fingernail Injuries
How long does it take a fingernail to grow back after falling off?
A new fingernail typically requires several months to grow completely from the base of the nail to the fingertip. Growth rates vary from person to person.
Can a fingernail grow back after being completely ripped off?
It often can if the nail matrix responsible for producing the nail remains intact. Significant damage or scarring to the matrix can affect future nail growth.
Can a slammed finger permanently damage a fingernail?
It is possible. A severe crush injury can damage the nail bed or nail matrix and may also cause a fingertip fracture. The extent of the injury determines whether changes to the nail are temporary or permanent.
Why is my fingernail growing back differently after an injury?
Trauma can temporarily interrupt normal nail production. Significant injury to the nail matrix can sometimes result in lasting ridges, splitting, thickening, or changes in the shape of the nail.
When should I see a doctor for a fingernail injury?
Seek medical attention for severe pain, significant bleeding or swelling, a deeply torn or detached nail, numbness, deformity, difficulty moving the finger, signs of infection, or concern about an underlying fracture.
