Background: A new variant of endemic pemphigus foliaceus is present in El Bagre, Colombia, and surrounding municipalities (El Bagre-EPF) that affects the skin and in some presentations affects other organs with autoantibodies directed against cell junctions.
Methods: We studied 200 El Bagre-EPF patient perilesional skin biopsies, as well as 200 skin biopsies from normal controls in the endemic area.
Results: We observed blister extrusions of sebaceous glands or entire pilosebaceous units via the isthmus in 23% of the patients and not in the controls.
Conclusions: The extrusion of hair follicular unit contents is consistent with our previous pathologic findings of autoreactivity to these units, and their observed clinical decrease in patients affected by El Bagre-EPF.
Keywords: endemic pemphigus foliaceus in El Bagre (El Bagre-EPF); pilosebaceous units; sebaceous glands.
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