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Dilated pore of Winer
Other Resources UpToDate PubMed

Dilated pore of Winer

Contributors: Erin X. Wei MD, Mari M. Batta DO, Whitney A. High MD, JD, MEng, Susan Burgin MD
Other Resources UpToDate PubMed


Dilated pore of Winer (or dilated pore) is a benign adnexal tumor with differentiation toward hair structures. It is a common lesion that may be acquired due to inflammatory cystic acne or actinic damage. Clinically, the condition appears as a solitary, enlarged pore filled with keratin, most commonly situated on the head and neck, but it can also be seen on the trunk of middle-age to elderly adults. The cavity is filled with lamellar keratin, and patients will often report expression of white, caseous keratin debris from the pore that will refill over several weeks.

Although typically asymptomatic, inflammation or infection may occur with manipulation.


L73.9 – Follicular disorder, unspecified

254692003 – Winer's dilated pore

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Diagnostic Pearls

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Differential Diagnosis & Pitfalls

  • Pilar sheath acanthoma
  • Trichofolliculoma
  • Epidermoid cyst
  • Hair cortex comedo
  • Acne comedone
  • Favre-Racouchot syndrome
  • Large-pore BCC – A rare variant that presents as a dilated pore. A shiny border may be seen.
  • Cutaneous squamous cell carcinoma – Rarely may present with a central dilated pore.
  • Steatocystoma multiplex
  • Eruptive vellus hair cyst
  • Trichoblastoma with a central dilated pore have also been reported.

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Management Pearls

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Last Reviewed:10/31/2021
Last Updated:10/31/2021
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Dilated pore of Winer
A medical illustration showing key findings of Dilated pore of Winer : Black color, Face, Open comedone
Clinical image of Dilated pore of Winer - imageId=1388543. Click to open in gallery.  caption: 'A close-up of a keratin-filled pore.'
A close-up of a keratin-filled pore.
Copyright © 2024 VisualDx®. All rights reserved.