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a Vertical section of a punch biopsy from a facial papule of Patient 1, revealing preserved sebaceous glands with a dilated duct (red arrow). Involvement of vellus hair by a mild lymphocytic inflammatory infiltrate can also be noted (blue arrow). HE. ×10. Colors refer to the online version only. b Orcein staining demonstrating a mild reduction and fragmentation of elastic fibers in the reticular dermis surrounding the sebaceous unit.
