Painful lesions or damaged skin areas on the undersurface of the feet primarily at points of pressure: Such areas of pain can be caused by plantar warts that are recognized by very small black spots or hard, horny, rough-surfaced areas on the lower sides of the feet.

Plantar warts are often acquired by walking bare-footed on contaminated floors near swimming pools and communal showers.

As a result of pressure from the weight of the body, plantar warts are flattened and forced into the skin on the base of the feet; often causing discomfort or even pain when a person is standing or walking.