Warts are small, benign growths on the skin caused by the human papillomavirus (HPV). They can appear anywhere on the body but are most commonly found on the hands, feet, and face. Warts are usually rough and raised, and they can vary in color from skin-toned to dark brown. There are several types of warts, including common warts, plantar warts, and flat warts. While they are generally harmless, some people may choose to remove them for cosmetic reasons or if they cause discomfort. Treatments include over-the-counter medications, cryotherapy, and laser therapy.