Have you seen any good films recently? <a href=" http://www.fratellis-steakhouse.com/drugs-med-discount-code/ ">prescription drugs that damage kidneys</a> 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.