Verruca vulgaris and verruca plana juvenilis are classified by Jadassohn1 among the benign epitheliomas of infectious origin. The filiform wart of the face and scalp is closely related, and there is good evidence for classifying condyloma acuminatum in this group. The plantar wart is probably of the same etiology, although this relationship has not been demonstrated experimentally. Experiments by Ullman,2 not yet repeated by other observers, suggest that the papilloma of the larynx of childhood may fall in the same group. The relationship between the various types has been demonstrated by the production of verruca vulgaris and verruca plana juvenilis from condyloma acuminatum and from filiform warts,3 and by the production of verruca plana juvenilis from material derived from a laryngeal papilloma.2
Frey3a discussed the relationship between warts and condyloma acuminatum. Two thirds of the patients with condyloma that he observed were free from syphilis,