Swelling and pain that affects mucous membranes (e.g., eyelids and lips) and sometimes genitals ... Warts are caused by the human papillomavirus (HPV). They tend to occur in groups and are contagious.

While all skin warts are caused by a virus called human papillomavirus (HPV), they can appear in different forms, as follows: When a wart is not going away despite treatment, it is best to contact ...