Runner's toe is a common condition seen in runners caused by downward pressure or horizontal separation of nail plate from the nail bed. This repetitive traumatic injury leads to bleeding and pooling of blood underneath the nail plate. Clinically, it is characterized by reddish-black discoloration of the toe nail.
Thereof, why are my big toenails turning black?
Nails change colors for multiple reasons. The most common culprit for a black toenail is blood under the hard tissue. Damage to the end of the toe causes blood to leak through the nail bed and stain the keratin a dark color. This is also known as a subungual hematoma, or a bruise under the nail.
What does it mean when your toenails turn dark?
Fungal infections: While these often look white or yellow, fungal infections can sometimes cause black toenails from debris buildup. Trauma: Usually caused by an injury, trauma to the toenail can cause the blood vessels beneath a nail to break.
Why do marathon runners lose their toenails?
Losing Toenails to Exercise. It is called onychoptosis, which means “falling nail” in Greek, and is typically caused by injury or stress to the nail. For runners going long distances, toenail loss may occur because of shoes that are too snug or foot swelling that causes the nail to rub the end of the shoe.