A dilated pore of Winer is a hair structure anomaly that appears as an enlarged solitary comedo.  Most commonly, it appears on the face of a middle-aged person. This condition is not associated with acne vulgaris. See the images below.
A dilated pore of Winer is a tumor of the intraepidermal follicle and infundibulum of a pilosebaceous apparatus.  An immunohistochemical study using monoclonal antibodies against cytokeratins and involucrin confirmed differentiation toward the infundibulum and partly toward the isthmus. 
Most cases of dilated pore of Winer are reported in older adults in both the American and European literature.
Most cases of dilated pore of Winer have been reported in white males.
Although dilated pores are found in both sexes, they appear to occur in men more often than in women.
Most cases of dilated pore of Winer are diagnosed in individuals older than 40 years; however, many individuals report that they have had the lesions for many decades, usually starting when they are aged 20-60 years.