Vellus hair cyst

    Clinical Features:

    • One- to three-millimeter pigmented cysts presenting most commonly on the chest, abdomen or extremities
    • Single, sporadic lesions usually present in the first two decades of life.
    • Multiple lesions represent an autosomal dominant disorder known as eruptive vellus hair cysts.  These present at a younger age and can be associated with other cutaneous lesions (steatocystoma multiplex, trichostasis spinulosa, pachyonychia congenita) and neurologic disorders.

    Histologic Features:

    • Dermal cyst lined by squamous epithelium with an attenuated granular layer
    • The cyst contains vellus hair shafts and lamellated keratin
    • The cyst wall sometimes contains telogen-like hair follicles.
    External Links:

     

    Cases associated with this book:

  • Vellus hair cyst
    Author: Artur Zembowicz M.D. Ph.D.

    Conference: DermatopathologyConsultations.com Teaching Collection