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Related Experiment Videos

Eruptive vellus hair cysts

N B Esterly, D F Fretzin, H Pinkus

    Archives of Dermatology
    |April 1, 1977
    PubMed
    Summary

    Eruptive vellus hair cysts present as a rare skin condition in children, characterized by persistent, pigmented papules. Histological examination reveals unique dermal cysts containing vellus hair fragments.

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    Area of Science:

    • Dermatology
    • Pediatric Dermatology
    • Histopathology

    Background:

    • Vellus hair cysts are uncommon follicular developmental anomalies.
    • Their occurrence in children, particularly as an eruptive phenomenon, is rare.
    • Understanding the etiology of pediatric skin conditions is crucial for accurate diagnosis and management.

    Observation:

    • Two pediatric patients presented with a long-standing, hyperpigmented, monomorphous papular eruption.
    • The lesions were distributed across the skin and had persisted for several years.
    • Clinical presentation suggested a chronic, benign dermatosis.

    Findings:

    • Dermal biopsies revealed the presence of multiple cysts located in the mid-dermis.
    • These cysts were filled with numerous fragmented vellus hair shafts.
    • The histological findings were consistent with a unique cystic structure related to vellus hair follicles.

    Implications:

    • The distinct histopathological findings support the recognition of a new entity: eruptive vellus hair cysts.
    • The spontaneous involution in one case suggests a potentially self-limiting nature of the condition.
    • Further research is needed to elucidate the obscure etiology and pathogenesis of eruptive vellus hair cysts in children.

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