Corns and calluses can be annoying, but your body actually forms them to protect sensitive skin. Corns and calluses are often confused with one another.
Corns generally occur on the tops and sides of the feet. A hard corn is a small patch of thickened, dead skin with a central core. A soft corn has a much thinner surface and usually occurs between the 4th and 5th toes. A seed corn is a tiny, discrete callous that can be very tender if it's on a weight-bearing part of the foot....
Athletes who take part in high-impact sports involving running or jumping are at high risk of forefoot injury. While track and field runners are exposed to the highest level of traumatic forces to the forefoot, many other athletes, including tennis, football, baseball, and soccer players, often have forefoot injuries.
SYMPTOMS AND CAUSES
The primary symptom of metatarsalgia is pain at the end of one or more of the metatarsal bones. The pain is typically aggravated when walking or running. Athletes who participate in high-impact activities and may also have an inflammatory condition such as bursitis often have diffuse forefoot and midfoot pain.
Most often, the pain comes on over a period of several months, rather than suddenly.
A condition known as Morton's neuroma (interdigital neuroma) produces symptoms of metatarsalgia due to irritation and inflammation of a nerve at the site of pain. People with Morton's neuroma may experience toe numbness in addition to pain in the forefoot.
The foot can be injured during sports activities. As with many other overuse injuries, the condition may be the result of an alteration in normal biomechanics that has caused an abnormal weight distribution.
Persistent stress can lead to chronic irritation and inflammation of the bone covering and adjacent tissues, such as ligaments and tendons.
The following factors can contribute to excessive localized pressure over the forefoot:
Excessive pronation (side-to-side movement of the foot when walking or running)
Some anatomical conditions may predispose individuals to forefoot problems. They include:
A high arch
A short first metatarsal bone or a long second metatarsal bone is often seen in people with a Morton toe; the normal forefoot balance is disturbed, resulting in the shift of an increased amount of weight to the second metatarsal.