Vellus Hair Cysts Presenting as an Atypical Acneiform Eruption

    August 2011 in “ Anais Brasileiros de Dermatologia ”
    Hiram Larangeira de Almeida, Lisia Martins Nudelmann, Joice Göebel, Nathália Janovik, J. Hein
    TLDR Vellus hair cysts can cause acne-like bumps that don't respond to treatment.
    A 32-year-old male experienced an 8-month-long, therapy-resistant acneiform eruption on his back and buttocks, characterized by inflammatory papules that led to hyperpigmentation and non-inflammatory papules resembling rice grains. Light microscopy revealed small keratin-filled cysts with vellus hairs, leading to a diagnosis of vellus hair cysts. The study suggested that vellus hair cysts should be considered in cases of multiple papules or acneiform eruptions that do not respond to treatment.
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