Epidermal cysts may develop on any part of the body. Most of them are thought to occur following inflammation of the epithelium of the hair follicle. These found on the palm and sole where the hair follicle is absent have been considered to developmant of following a traumatic inclusion of the epidermis into the Dermis. Because only a few cases w re known to be related to preceding trauma, the latter assumption has been questioned. Reerly, the HPV-like virions and papillomavirus genus-speciric antigen were detected in the epicrml cyst of the sole in some reports. 1 our cases of plantar epidermal cyst were studied for the presence of human papillomavirus using conventional histologic and immunohistochemical examinator Histologic examination showed three characteristic findings, that is, intracytoplasmic eosinophil odies in the cyst wall, parakeratosis within the cyst caviti, and vacuolar structures disperse the wall and cavity. In all of the cases, immunohistochernical staining was positive for papule evirus antigen. These findings suggest an etiologic as.iation between the papillomavirus infection and plantar epidermal cyst.
Dermis ; Eosinophils ; Epidermal Cyst* ; Epidermis ; Epithelium ; Hair Follicle ; Humans* ; Inflammation ; Papilloma* ; Papillomavirus Infections ; Parakeratosis ; Virion