Warts are local growths on the skin that are caused by?

But common warts are actually an infection in the top layer of skin, caused by viruses in the human papillomavirus, or HPV, family. When the virus invades this outer layer of skin, usually through a tiny scratch, it causes rapid growth of cells on the outer layer of skin - creating the wart.

They are caused by viruses in the human papillomarvis also know as the hover family when the virus invades this outer layer of skin usually through any scratch it causes rapid growth of cells on the outer layer of skin-creating the wart