Why does foot corn has thick skin around it

What is the treatment of foot corn?
Topical medications such as salicylic acid
cuterization with frozen nitrogen
cuterization with electricity
Surgical removal
Laser
What is the cause of foot corn?
The cause is an infection with the human papilloma virus.
What are the symptoms of foot corn?
Symptoms include:
Swelling of the place where it appeared
pain
The appearance of skin growths
or thinckness
warts