Case Presentation
A 20-year-old female complained of an asymptomatic papule on the left postauricular skin that occurred shortly after birth. The lesion presented a single papule with double-orifice comedones (Figure 1A). At the same site, previous skin lesion or inflammation were not observed. The dermoscopy manifested double-ended pseudo-comedones (Figure 1B). Childhood flexural comedones (CFC) with late diagnosis in adulthood was established.
Figure 1.
(A) A single papule with double-orifice comedones on the left postauricular skin. (B) The dermoscopy manifested double-ended pseudo-comedon.
Teaching Point
CFC usually occur in the skin folds including axilla, neck, cubital fossa, and perineum, and present as double opening comedones connected by a thin layer of the epidermis. The etiology hypotheses included potential precursors of hidradenitis suppurativa, friction, genetic background, and hamartomatous origin [1]. Histopathology showed typical open comedo with follicular plugging and infundibular dilatation [2]. Three different dermoscopic patterns of CFC have been described including cuneiform comedo, multi-orifice comedo, and double-ended pseudo-comedones [1]. The differential diagnosis includes other diseases associated with comedones, such as nevus comedonicus, acne neonatorum, familial dyskeratotic comedones, and idiopathic disseminated comedones.
Footnotes
Funding: None.
Competing interests: None.
Authorship: All authors have contributed significantly to this publication.
References
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