Clinical Dermatology Review

: 2019  |  Volume : 3  |  Issue : 1  |  Page : 96--98

Dermoscopic characterization of dilated pore of winer: Report of two cases

Keshavmurthy A Adya1, Arun C Inamadar1, Aparna Palit2,  
1 Department of Dermatology, Venereology and Leprosy, Shri B M Patil Medical College, Hospital and Research Center, BLDE University, Vijayapur, Karnataka, India
2 Department of Dermatology and Venereology, All India Institute of Medical Sciences, Bhubaneswar, Odisha, India

Correspondence Address:
Arun C Inamadar
Department of Dermatology, Venereology and Leprosy, Shri B M Patil Medical College, Hospital and Research Center, BLDE University, Vijayapur - 586 103, Karnataka


Dilated pore of Winer is a benign tumor of infundibulum of the pilosebaceous unit. The morphological features of this condition are characteristic enough to allow a clinical diagnosis. It generally presents as an enlarged solitary open comedone-like lesion on the head and neck region or the trunk of elderly individuals. Although the diagnosis is mainly clinical, dermoscopy may be of further assistance. However, to the best of our knowledge, there are no documented dermoscopic features of the classical type of this disorder as in our cases. We report the dermoscopic findings of two cases along with clinical and histopathological correlation.

How to cite this article:
Adya KA, Inamadar AC, Palit A. Dermoscopic characterization of dilated pore of winer: Report of two cases.Clin Dermatol Rev 2019;3:96-98

How to cite this URL:
Adya KA, Inamadar AC, Palit A. Dermoscopic characterization of dilated pore of winer: Report of two cases. Clin Dermatol Rev [serial online] 2019 [cited 2021 Oct 27 ];3:96-98
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Full Text


Dermoscopy is a noninvasive diagnostic tool that enables a magnified visualization of the skin surface and subsurface structures. It has become an integral part of clinical assessment of any skin lesion and is no more restricted to the pigmented lesions, for which it was primarily used in the past.

Dilated pore of Winer is a common, benign tumor of the infundibulum of the pilosebaceous unit presenting as an enlarged, solitary open comedone-like lesion. Although the clinical diagnosis of this disorder is quite straightforward, dermoscopic assessment further complements the clinical features and helps in differentiating from other related disorders as well.

 Case Reports

Case 1

A 48-year-old male presented with a large, open comedone-like lesion on the lower back measuring about 3 mm × 3 mm surrounded by scaly skin for the past 8 months [Figure 1]a. Dermoscopy (noncontact, polarized mode) using DermLite™ DL3 revealed a central bluish-black homogenous area surrounded by translucent grayish-whitish halo and a peripheral rim of slight hyperpigmentation [Figure 1]b. Hematoxylin and eosin analysis revealed a markedly dilated follicular ostium filled with lamellated keratin and lined by infundibular epithelium with small finger-like projections into the adjacent dermis. Adjoining epidermis showed hyperkeratosis and parakeratosis [Figure 2].{Figure 1}{Figure 2}

Case 2

A 62-year-old female presented with two asymptomatic crateriform lesions measuring 4 mm × 2 mm and 4 mm × 1 mm plugged with dark keratin-like material on the back from the past 6 months [Figure 3]a. Noncontact dermoscopy under polarized mode revealed a crater-like pattern with a central homogeneous bluish-black structureless area surrounded by a grayish-white halo, with a discreet peripheral pigment network [Figure 3]b and [Figure 3]c. Histopathological analysis could not be done in this patient as she refused biopsy. The clinical features, however, were classical of dilated pore of Winer.{Figure 3}


Dilated pore of Winer is a common, benign tumor of the infundibulum of the pilosebaceous unit. It is usually seen in the head and neck region or the trunk of elderly individuals. It presents as an aymptomatic, enlarged solitary comedone without any perilesional inflammation or induration. Histopathologically, single or multiple contiguous enormously dilated follicular infundibula are seen that are lined by an acanthotic infundibular epithelium projecting several finger-like projections into the adjacent dermis. Excessive melanization of this epithelium and/or the central keratin plug is also observed. Surgical excision is the definitive treatment, indicated only for cosmetic reasons.[1],[2],[3]

Dermoscopy in both cases revealed similar features as described above. The central homogenous bluish-black material corresponds histopathologically to the lamellated keratin filling up the follicular infundibulum and clinically resembling a large, open comedone. The translucent grayish-white margin corresponds to scaling due to epidermal hyperplasia around the follicular infundibulum. The peripheral hyperpigmented rim is indicative possibly of the postinflammatory hyperpigmentation seen around a chronic lesion. Literature on dermoscopy of dilated pore of Winer is quite scarce, and to the best of our knowledge, there is only one report which, however, describes dermoscopic features of a rather less typical clinical presentation of the condition.[4]

Pilar sheath acanthoma is indistinguishable from dilated pore of Winer both clinically and histologically. However, it is almost exclusively seen on the upper lip of the elderly and histopathologically may exhibit a larger and more irregular central cavity and multiple lobulated masses of cells extending into the surrounding dermis rather than the finger-like projections in the latter.[1],[2],[3] In dermoscopic analysis of a case of pilar sheath acanthoma, Iino and Ito observed multiple column-like or small blocks of keratotic areas in the central plug and a few tips extending from the edges onto the center which they describe as “central multiple horn pattern.”[5] This feature differed from the central homogenous bluish-black keratotic material seen in our cases. However, since this is the only documented anecdotal observation available in the literature on dermoscopy of pilar sheath acanthoma, and the fact that our dermoscopic analysis of classical dilated pore of Winer is also a novel one, we believe that it cannot be concluded at this point with certainty if the two disorders can be differentiated dermoscopically.


Dilated pore of Winer is a follicular disorder with characteristic clinical features. Dermoscopic evaluation may be of further assistance in asserting the clinical diagnosis or when other follicular disorders with similar features such as pilar sheath acanthoma have to be differentiated. However, due to the scarcity of data, further dermoscopic observations are required to establish any reproducible dermoscopic patterns of this disorder.

Declaration of patient consent

The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.

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Conflicts of interest

There are no conflicts of interest.


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2Srivastava D, Taylor RS. Appendage tumors and hamartomas of the skin. In: Goldsmith LA, Katz SI, Gilchrest BA, Paller AS, Leffell DJ, Wolff K, editors. Fitzpatrick's Dermatology in General Medicine. 8th ed. New York: The McGraw-Hill Companies; 2012. p. 1337-62.
3Weedon D, editor. Tumors of cutaneous appendages. In: Weedon's Skin Pathology. 3rd ed. Edinburgh: Churchill Livingstone Elsevier; 2010. p. 758-807.
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