Plantar wart signs and symptoms include:
- A small, fleshy, rough, grainy growth (lesion) on the bottom of your foot
- Hard, thickened skin (callus) over a well-defined "spot" on the skin, where a wart has grown inward
- Black pinpoints, which are commonly called wart seeds but are actually small, clotted blood vessels
- A lesion that interrupts the normal lines and ridges in the skin of your foot
- Pain or tenderness when walking or standing
When to see a doctor
See your doctor for the lesion on your foot if:
- The lesion is painful or changes in appearance or color
- You've tried treating the wart, but it persists, multiplies or recurs
- Your discomfort interferes with activities
- You also have diabetes or poor sensation in your feet — in which case, you'll need treatment supervised by a doctor
- You also have a weakened immune system because of immune-suppressing drugs, HIV/AIDS or other immune system disorders
- You aren't sure whether the lesion is a wart
Plantar warts are caused by an infection with the human papillomavirus (HPV) in the outer layer of skin on the soles of your feet.
More than 100 types of HPV exist, but only a few cause warts on your 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.
The virus also needs to have a point of entry into the skin of the foot:
- Cracks in dry skin
- Cuts or scrapes
- Wet, softened, fragile skin from being in the water a long time
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 public showers
When plantar warts cause pain, you may alter your normal posture or gait — perhaps without realizing it. Eventually, this change in how you stand, walk or run can cause muscle or joint discomfort.
To reduce your risk of plantar warts:
- Avoid direct contact with warts. This includes your own warts.
- Keep your feet clean and dry. Change your shoes and socks daily.
- Wear shoes or sandals where it's common to be exposed to a wart-causing virus, such as around swimming pools or in gym showers.
- Don't pick at warts. Picking may spread the virus.
- Don't use the same emery board, pumice stone or nail clipper on your warts as you use on your healthy skin and nails.
- Use a disposable emery board, to avoid spreading the virus.
- Wash your hands carefully after touching your warts.