08/05/2020
Plantar warts are caused by an infection with HPV in the outer layer of skin on the soles of your feet. They develop when the virus enters your body through tiny cuts, breaks or other weak spots on the bottoms of your feet.
HPV is very common, and more than 100 kinds of the virus exist. But only a few of them cause warts on the feet. Other types of HPV are more likely to cause warts on other areas of your skin or on mucous membranes.
Transmission of the virus
Each person's immune system responds differently to HPV. Not everyone who comes in contact with it develops warts. Even people in the same family react to the virus differently.
The HPV strains that cause plantar warts aren't highly contagious. So the virus isn't easily transmitted by direct contact from one person to another. But it thrives in warm, moist environments. Consequently, you may contract the virus by walking barefoot around swimming pools or locker rooms. If the virus spreads from the first site of infection, more warts may appear.
Risk factors
Anyone can develop plantar warts, but this type of wart is more likely to affect:
Children and teenagers
People with weakened immune systems
People who have had plantar warts before
People who walk barefoot where exposure to a wart-causing virus is common, such as locker rooms
Complications
When plantar warts cause pain, you may alter your normal posture or gait — perhaps without realising it. Eventually, this change in how you stand, walk or run can cause muscle or joint discomfort.
Prevention
To reduce your risk of plantar warts:
Avoid direct contact with warts. This includes your own warts. Wash your hands carefully after touching a wart.
Keep your feet clean and dry. Change your shoes and socks daily.
Avoid walking barefoot around swimming pools and locker rooms.
Don't pick at or scratch warts.
Don't use the same emery board, pumice stone or nail clipper on your warts as you use on your healthy skin and nails.
Reference: https://www.mayoclinic.org/diseases-conditions/plantar-warts/symptoms-causes/syc-20352691?p=1
This is my medical opinion and does not substitute doctor-patient relationship.