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Simple foot injuries can cause you toenail to fall off. Car accidents, sports, and dropping something on your foot can all damage your toenail.
If you injure your toenail, it might look black or purple under your toenail. This is due to something called a subungual hematoma, which causes blood to collect under your injured toenail. As blood builds up under your nail, it may separate from your nail bed. It can take several weeks for your toenail to completely fall off.
Contact your doctor if the subungual hematoma covers more than a quarter of your toenail. If you feel throbbing or intense pain near the hematoma, your doctor can use a heated needle or wire to make a small hole in your toenail to relieve the pressure.
Otherwise, you can treat your injured toe at home by:
soaking it in cold water for 20 minutes
elevating it
clipping any sharp or jagged edges of the remaining nail
cleaning any exposed part of your nail bed and applying an antibiotic ointment
applying a fresh bandage daily for the next 7 to 10 days, or until the skin hardens
taking nonsteroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen (Advil, Motrin), to help with the pain
Depending on which toenail fell off, it can take anywhere from six months to two years for the nail to completely grow back. Make sure to closely trim the rest of your toenails and wear well-fitting shoes to prevent any future injuries.
If your toenail falls off, it’ll usually grow back within a few months to a year. However, depending on the cause and the size of the lost toenail, it could take up to two years.
Contact your doctor if your toenail won’t stop bleeding or you have severe pain. You can reduce your risk of losing a toenail in the future by keeping your feet clean and your toenails smooth and short.