Vellus hair cysts presenting as an atypical acneiform eruption Cisto de pelo velos apresentando-se como erupção acneiforme atípica

A 32-year-old male patient presented for 8 months an asymptomatic therapy-resistant acneiform eruption on his back and buttocks. Skin examination showed several inflammatory papules, which evolved to hyperpigmentation. At the same distribution non inflammatory papules, which resembled rice grains, w...

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Bibliographic Details
Main Authors: Hiram Larangeira de Almeida Jr, Lisia Nudelmann, Joice Göebel, Nathália Janovik, Juliana Hein
Format: Article
Language:English
Published: Sociedade Brasileira de Dermatologia 2011-08-01
Series:Anais Brasileiros de Dermatologia
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Online Access:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0365-05962011000400027
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Summary:A 32-year-old male patient presented for 8 months an asymptomatic therapy-resistant acneiform eruption on his back and buttocks. Skin examination showed several inflammatory papules, which evolved to hyperpigmentation. At the same distribution non inflammatory papules, which resembled rice grains, were also observed. Light microscopy showed small keratin-filled cysts, with an epithelial multilayered wall, without granular layer. Keratin and some vellus hairs were identified inside the cyst, confirming the diagnosis of vellus hair cysts. Diagnosis of vellus hair cysts should be suspected in cases of multiple papules or therapy-resistant cases of acneiform eruptions<br>Um paciente de 32 anos apresentou há 8 meses uma erupção acneiforme resistente à terapêutica, localizada no dorso e nádegas. Ao exame apresentava inúmeras pápulas inflamatórias, que evoluiam para hiperpigmentação. Na mesma distribuição havia lesões não inflamatórias, lembrando grão de arroz. A microscopia óptica demonstrou cisto dérmico cuja parede era de epitélio estratificado, sem camada granular, preenchido de queratina e com pelos no interior, confirmando o diagnóstico de cisto de pelo veloso. Essa entidade deve ser suspeitada em casos de múltiplas pápulas ou erupções acneiformes resistentes à terapia
ISSN:0365-0596
1806-4841