I have a bruise on my nail when will it come off?

Subungual hematoma: When you walk or run wearing tight shoes, your toenail would be hit repeatedly to the edge of the shoe. The blood vessels under the toenail break and cause bleeding under the toenail. This is also known as subungual hematoma. Due to accumulated blood, the nail can turn black and fall off automatically with a new toenail growth. Avoid forced removal. See a doc for pain, redness, swelling or pus.

Toe nail?: It may or may not come off with bleeding under the nails. If it is on one of your toe nails and you haven't had obvious trauma - make sure that you wear shoes that give you toes space and rotate wearing different pairs of shoes.

Depends: Bleeding under the nail may or may not create pressure that cuts off blood flow to the uninjured nail bed causing nail loss. If a hole is drilled in the nail to relieve the pressure within the first hours, no loss should occur. If the bleed is minor, it will just stain the underside and gradually grow out. If lost the nail may regrow if the nail bed base retained normal blood flow.

Weeks to months...: Depending on what part of the nail is injured as well as its severity. If the bruising is mild, it may heal quickly. If the injury is more severe such that it is causing damage to the nail bed or forming a "blood-clot" from bleeding into the area, it may take however long it is for your nail to grow to the tip/edge of your toe/finger. It is faster for a finger nail to grow comparing to toenail.

Bruise: The tissues underlying the nail should heal with time. However, your nail may need to grow out before discoloration is gone.