Friction-induced pagetoid dyskeratosis.

Background: Pagetoid dyskeratosis (PD) is characterized by pale cells within the epidermis resembling those of Paget disease. These cells have been seen as an incidental finding in a variety of benign papules most commonly located in intertriginous areas. The lesion is considered a reactive process in which a small proportion of the normal population of keratinocytes is altered. Among the triggers for this lesion, friction has been suggested; however, a direct cause-and-effect relationship has not yet been reported.

Results: We confirmed the relationship between PD and friction in a biopsy taken from a 19-year-old woman who presented with clinical features indicating exogenously induced bullae and erosions and consented to a biopsy of a lesion immediately after its induction, demonstrating combined features of PD and friction bulla.