The human papillomavirus virus (HPV) causes warts, and over 100 types of the virus exist. Warts are normally harmless but when they appear on the bottom of the feet, they can cause irritation and pain. Called plantar warts when on the feet, these rough, cauliflower-shaped growths resemble calluses and may appear on the heel, bottom of the big toe or ball of the foot--weight-bearing areas that produce the most pain.
Wart Transference
Coming into contact with a wart then touching the feet can spread the virus, particularly with the transference of skin or blood from the wart.
Cuts in the Skin
Dry, cracked skin or scrapes and cuts on the feet can easily introduce a form of HPV into your body.
Bare Feet
Walking barefoot, particularly in public areas like parks and beaches, can introduce the HPV virus into your body, causing warts.
Communal Facilities
Public or communal facilities with moist, warm environments like locker rooms and swimming pool areas are a good breeding ground for the HPV virus.
Weakened Immune System
Most HPV infections are successfully defeated by antibodies in the blood but people with weakened immune systems can be highly susceptible to infection.
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