Filiform warts are: . made up of thin projections of skin that can be 1–2 millimeters long .usually found around a person’s eyes and lips .brown, pink, yellowish, or flesh-colored .usually isolated, not in clusters These warts, like others, are caused by the human papillomavirus (HPV). This virus can be spread through skin-to-skin contact, and the risk of infection is higher if the skin is broken.