Concepts of False Warts and True Warts Warts are common skin lesions that are usually caused by viral infections. False warts and true warts are two different types of warts. They are different in shape, etiology, clinical manifestations, etc. False warts are skin lesions that look similar to warts but are not caused by a viral infection. It is usually caused by skin friction, pressure, etc. and is not contagious. True warts are skin lesions caused by human papillomavirus (HPV) infection and are contagious. Commonly found on fingers, soles, anus, genitals and other parts of the body. morphological characteristics