<unk>  is most likely not a human papillomavirus associated lesion and the foam cells in the lesions are most likely derived from the monocyte—macrophage lineage. More research is needed to determine the cause.
Verruciform xanthoma
Pseudoxanthoma elasticum
Phakomatosis
Metachondromatosis
Keratoacanthoma
Linear and whorled nevoid hypermelanosis
Acanthoma fissuratum
Erythromelanosis follicularis faciei et colli