Will a Smashed Fingernail Grow Back?

After a nail separates from the nail bed for whatever reason, it will not reattach. A new nail will have to grow back in its place. Nails grow back slowly. It takes about 6 months for a fingernail and up to 18 months for a toenail to grow back.

How long does it take for a smashed fingernail to fall off?

Unless the area of bleeding is very small, an affected nail will usually fall off on its own after several weeks because the pooled blood has separated it from its bed. A new fingernail can regrow in as little as 8 weeks.

What happens if you leave blood under your nail?

If left untreated, a simple subungual hematoma typically grows out with the lengthening nail plate and resolves on its own, although sometimes subungual hematomas can result in your nail falling off (onycholysis). Until the nail grows out, however, you can expect weeks to months of blue-black discoloration.