Plantar wart signs and symptoms include:

• A small, fleshy, rough, grainy growth (lesion) on the bottom of your foot, usually the base of the toes and forefoot or the heel
• 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

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.

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

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.