Common warts are small, non-cancerous growths that can appear on the skin. They are caused by the human papillomavirus (HPV) and are contagious. Common warts can appear anywhere on the body, but are most common on the hands, feet, and face. They are usually skin-colored and have a rough, bumpy texture. Common warts can be treated with over-the-counter medications, but may require medical treatment if they do not respond to these treatments.