The colonies are covered by wart-like growths called verrucae. The walls of the column are covered by wart-like tubercles known as verrucae. HPV vaccines do not currently protect against the virus strains responsible for plantar warts (verrucae). Skin infections with HPV can cause noncancerous skin growths called warts (verrucae). The column is usually shorter than its diameter and its surface is covered in verrucae. On these verrucae, there are fine setae, even on the ones distributed on the flanks. Although most arctiid larvae have verrucae, "Utetheisa ornatrix" larvae lack these.