Cutaneous and mucosal warts. Clinical and histopathological criteria for classification

The clinical and histopathological study of cutaneous and mucosal warts demonstrates divergences between clinical and histopathological diagnoses among the group of myrmecias, mosaics, acrodigitate, and common warts. There is correlations criteria (when considered separately), such as hyperkeratosis and absence of keratohyaline granules in flat warts, and in ano-genital vegetations. The existence of clinical and histological overlaps emphasizes that it is not clear whether these cases are rare clinical varieties caused by as yet unknown types of human papillomaviruses, or rather by differences in the degree of keratinization at different sites in the body.