Detection of human papillomavirus type 10 DNA in eccrine syringofibroadenomatosis occurring in Clouston's syndrome.

Syringofibroadenomatosis is often associated with an underlying condition such as diabetes mellitus or hidrotic ectodermal dysplasia. By reason of these associations, a reactive or hamartomatous cause is suspected. We report a case of a 71-year-old woman with Clouston's syndrome in whom progressive multiple palmoplantar syringofibroadenomas developed over a 10-year period. The syringofibroadenomas formed flat-topped papules simulating verruca plana; the widespread distribution and chronic progressive course resembled epidermodysplasia verruciformis. Contiguous with the syringofibroadenoma's characteristic epithelial-stromal proliferation were epidermal changes of verruca plana. Evidence of human papillomavirus (HPV) infection was verified by immunolabeling with antibodies to bovine papillomavirus type 1 and detection of HPV 10 viral DNA by means of polymerase chain reaction. Rather than a hamartomatous process, these findings suggest that syringofibroadenomas occurring in the setting of Clouston's syndrome could represent an HPV-induced epithelial proliferation.