If you lose a fingernail or toenail, the nail will almost always grow back on its own. A fingernail takes about 4 to 6 months to fully regrow, while a toenail can take up to 18 months. The process is slow and sometimes uncomfortable, but as long as the growth center at the base of your nail stays intact, a new nail will eventually replace the old one.
Why Nails Fall Off
Nails can come off for a wide range of reasons. The most obvious is direct trauma: slamming a finger in a door, dropping something heavy on a toe, or stubbing a toe hard enough that the nail loosens over the following days or weeks. Sometimes the nail detaches immediately. Other times, blood pools underneath and the nail gradually separates as a new one pushes it out from below.
Infection is the single most common cause of nails falling off without obvious injury, accounting for about 37% of cases in a large systematic review. Hand, foot, and mouth disease in children is a well-known trigger. Weeks after the illness resolves, one or more nails may loosen and shed. Fungal infections can also slowly destroy the nail plate until it crumbles or lifts away. Certain medications, particularly chemotherapy drugs and some anti-seizure medications, can interrupt nail growth enough to cause shedding. Less commonly, autoimmune conditions, severe fevers, or other systemic illnesses can temporarily shut down nail production, causing the nail to fall off weeks later.
What Happens to the Exposed Nail Bed
Once the nail is gone, the nail bed is exposed. This is the soft, pinkish skin that was directly underneath your nail plate. It’s rich in nerve endings, which is why it feels tender and sensitive to touch, temperature, and even air. The discomfort is usually worst in the first few days and gradually decreases as the skin hardens slightly.
The nail bed plays a small but important role in regrowth, contributing about 10% of the cells that form your new nail. More critically, it’s the surface the new nail needs to adhere to as it grows forward. If the nail bed is badly scarred or damaged, the new nail may grow in wavy, ridged, or partially detached rather than smooth and flat.
How a New Nail Grows Back
The real engine of nail growth is the nail matrix, a crescent-shaped zone of tissue tucked just beneath the skin at the base of your nail. About 90% of nail growth originates here. The matrix continuously produces new cells that harden into the nail plate, pushing it forward at an average rate of about 3.5 millimeters per month for fingernails and 1.6 millimeters per month for toenails.
That speed difference is why fingernails recover so much faster. A full fingernail regrows in roughly 4 to 6 months. A big toenail, which is both larger and slower-growing, can take 12 to 18 months. You’ll first notice a thin, slightly ridged nail emerging from under the cuticle. It may look different from your other nails for a while, appearing thinner, more opaque, or slightly uneven. This is normal. The nail typically returns to its usual appearance once it has completed a full growth cycle.
Factors like age, circulation, and overall health affect the timeline. Nails grow faster in younger people, during warmer months, and on your dominant hand.
Caring for the Exposed Nail Bed
The priority after losing a nail is keeping the area clean and protected. Gently wash the nail bed with soap and water. If there are minor cuts or scrapes around the nail, clean those as well. Cover the area with a simple bandage, and change it daily. A thin layer of antibiotic ointment can help prevent the bandage from sticking to the raw skin, which makes dressing changes less painful.
If you lost the nail on a finger, remove any rings from that hand right away. Swelling can develop quickly, and a ring on a swollen finger becomes a separate problem. If a ring is already stuck, that alone is worth a call to your doctor.
For the first week or two, you’ll want to protect the finger or toe from bumps and pressure. Wear closed-toe shoes if a toenail is missing, and be mindful when using your hands. The sensitivity fades as the new nail begins to cover the bed, but the area remains vulnerable to infection for several weeks.
Signs of Infection
An exposed nail bed is an open invitation for bacteria and fungi. Watch for increasing redness, swelling, and warmth around the nail fold, especially near the cuticle. Pain that gets worse rather than better over the first few days is a red flag. Pus-filled blisters or cloudy discharge are strong signs of a bacterial infection. If the surrounding skin becomes hot, streaked with red, or the pain becomes throbbing, you likely need treatment with antibiotics.
When the Nail May Not Grow Back Normally
The nail matrix is surprisingly resilient, but it can be permanently damaged. Crush injuries, deep lacerations, or fractures of the fingertip bone can scar the matrix in ways that distort future nail growth. A horizontal scar across the matrix can split the nail into two separate sections, creating what’s called a double nail. Scarring in other patterns can produce permanent ridges, grooves, or a nail that grows but won’t lie flat against the bed.
If the matrix is completely destroyed, the nail won’t grow back at all. This is rare outside of severe trauma or surgical removal for medical reasons. In some cases, a surgeon can graft healthy matrix tissue from another nail to restore growth, though the cosmetic result varies.
Injuries That Need Prompt Medical Attention
Not every lost nail needs a doctor’s visit. If the nail was already loose and came off cleanly with no deep wound underneath, home care is usually enough. But certain situations call for prompt evaluation. If the nail was torn off violently and the nail bed is lacerated or fragmented, repair may be needed to preserve normal regrowth. If the fingertip or toe looks deformed, or if you can’t straighten or bend the tip normally, a fracture of the underlying bone is possible. Displaced fractures near the nail matrix need stabilization, sometimes by a hand surgeon.
Heavy bleeding that doesn’t stop with 10 to 15 minutes of firm pressure, visible bone, or a large flap of skin are all reasons to head to an emergency department rather than waiting for a primary care appointment. The goal of early repair isn’t just wound healing. It’s protecting the matrix and nail bed so the nail has the best chance of growing back smooth and attached.