ease for foot to extend. Left: Proper fit A foot which has lost a toenail, due to running injuries exacerbated by poorly-fitting shoes, badly-cut nails, and mild Morton's toe The condition is caused by a traumatic injury, such as slamming a finger in a door, or from sports activities, especially those involving sudden accelerations, such as soccer, basketball, and tennis, or going downhill, such as running or hiking rugged terrain, and ill-fitting footwear. Repeatedly thrusting the toes against a shoe's toe box can cause a<unk>  called jogger's toe, runner's toe, or black toenail. In a marathon, several percent of runners may be affected. Wearing footwear which fits helps prevent runner's toe. If the shoe is too loose on the midfoot, the foot can slide forwards in the shoe, especially when going downhill. This may jam the toes into the end of the toebox. If the foot is sliding forwards because the shoe is too loose around the midfoot, it may be restrained by lacing the shoe carefully, or placing bulky padding between the tongue and the lacing, or by wrapping a strap in a figure-eight around the foot and ankle (image). Excessively tight or uneven fit around the midfoot may, however, cause tendon problems. Separately, if there is not enough space around the toes, the toes will also hit the toebox repeatedly. Feet become longer and wider when weight is put on them, because the arches flatten, and the toes also splay and bend. At the end of a long journey on foot, the arches flatten, the metatarsals spread, and the foot swells more than after a short one. The toes also need vertical space; a toe cap which is low enough to press on the top of the toe may also cause bruising under the nail, especially if the toe cap is stiff. If the toebox is pointed, the toes may be wedged forwards into the area with inadequate height. Nails which protrude unevenly may concentrate force on the toenail; properly-cut nails are therefore also important. Some susceptible runners may also have Morton's toe. In this variant of human foot anatomy, the second toe extends further out than the great toe. This can make it harder to find shoes with adequate space around the toes.
Subungual hematoma
Subcutaneous abscess
Periungual wart
Dens evaginatus
Pectus carinatum
Skin fissure
Epignathus
Omphalolith