Warts - plantar warts are caused by a virus. When exposed to the virus you may develop a single callus-like wart or multiple/clusters of warts. Warts may also appear spongy with tiny red, brown, or black spots. This is the blood supply the wart has developed to "feed" itself.
Warts are most commonly found on the bottom of the foot and are more common in children and adolescents. They may resolve once the body's immune system has mounted a response or they may spread and become painful.
There are many ways to treat warts depending on their size and location. Medication and/or surgical removal may be effective treatments.
If the warts are painful or persistent, professional evaluation and treatment is recommended.