A Dilated pore of Winer is essentially a large, solitary open comedone/blackhead. Dead skin cells get trapped and help widen this pore, and plugs up the opening. The expression of this plug squeezes out the macerated, white, soggy keratin/skin cells from the deeper portion of the pore. Once the content of the dilated pore is expressed, this whole process of the dilated pore filling once again with keratin is common. They are completely benign and are usually expressed for cosmetic reasons. A comedone extractor can be used to do this.