The plantar wart is often contracted by walking barefoot on dirty surfaces or littered ground where the virus is lurking. The virus thrives in warm, moist environments, making infection a common occurrence in communal bathing facilities.
If left untreated, warts can grow to an inch or more in size and can spread into clusters of several warts; these are often called mosaic warts. Like any other infectious lesion, plantar warts are spread by touching, scratching, or even by contact with skin shed from another wart. The wart may also bleed, another route for spreading.
Occasionally, warts can spontaneously disappear after a short time, and, just as frequently, they can recur in the same location.
When plantar warts develop on the weight-bearing areas of the foot—such as the ball of the foot or the heel—they can be the source of sharp, burning pain. Pain occurs when weight is brought to bear directly on the wart, although pressure on the side of a wart can create equally intense pain.
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