Corns (cont.)

Hyperkeratosis simply means thickening of the skin. This thickening occurs as a natural defense mechanism that strengthens the skin in areas of friction or excessive pressure. Abnormal anatomy of the feet, such as hammer toe or other toe deformities, can lead to corn or callus formation as can bony prominences in the feet. Footwear that is too tight or that exerts friction at specific points can also cause skin thickening that leads to corns and calluses. Abnormalities in gait or movement that result in increased pressure to specific areas can also be the cause.

It can be hard to know why finger corns develop since they often don't appear at sites of obvious pressure. Finger calluses may develop in response to using tools, playing musical instruments, or using work equipment that exerts pressure at specific sites.

As mentioned above, any condition or activity that results in increased friction over the fingers or toes can lead to the development of corns or calluses. People of all ages can be affected. Some of these risk factors are

• abnormalities in anatomy of the feet or toes;
• abnormalities in gait;
• bunions;
• poorly fitting footwear;
• using equipment, tools, or instruments that exert pressure on specific locations on the fingers;
• certain occupations, such as farmers or garden workers.

Corns and calluses are hardened, thick areas of skin. The area may be dry and may appear to be scaly or flaky. Corns and calluses can sometimes cause pain or discomfort if they interfere with walking or other activity, but they are typically painless.

Source: MedicineNet.com
http://www.medicinenet.com/corns/article.htm