There was a narrow dell in the epidermal surface, with a pattern of cornification identical to that seen in the cornoid lamella of porokeratosis. The stratum corneum formed a column of parakeratosis from the surface of the viable epidermis. This feature was limited to an area that appeared to be overlying the acrosyringium and was contiguous with it at the level of the granular layer of the surrounding skin. Thus, the findings appeared to overlie the ostium of the eccrine duct. There was an associated mild superficial dermal chronic infiltrate.
Multiple Punctate Pits in a 27-Year-Old Woman. Arch Dermatol. 2002;138(11):1509. doi:10.1001/archderm.138.11.1509